Home / 12,420.39-17,140.58-7,116.23

Finding the Fourth Proportional to 12,420.39, 17,140.58 and 7,116.23

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Solution

The fourth proportional to 12,420.39, 17,140.58 and 7,116.23 is: 9,820.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,420.39 : 17,140.58 = 7,116.23 : x
  2. Step 2: Convert to fraction form
    12,420.39/17,140.58 = 7,116.23/x
  3. Step 3: Cross multiply
    12,420.39x = 17,140.58 × 7,116.23
  4. Step 4: Simplify right side
    12,420.39x = 121,976,309.61
  5. Step 5: Solve for x
    x = 121,976,309.61/12,420.39
  6. Step 6: Final answer
    x = 9,820.65

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Half scale
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Double scale
Find fourth proportional to 12,421.39, 17,141.96 and 7,117.23
Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.