Home / 12,421.87-17,141.65-7,117.18

Finding the Fourth Proportional to 12,421.87, 17,141.65 and 7,117.18

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Solution

The fourth proportional to 12,421.87, 17,141.65 and 7,117.18 is: 9,821.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,421.87 : 17,141.65 = 7,117.18 : x
  2. Step 2: Convert to fraction form
    12,421.87/17,141.65 = 7,117.18/x
  3. Step 3: Cross multiply
    12,421.87x = 17,141.65 × 7,117.18
  4. Step 4: Simplify right side
    12,421.87x = 122,000,147.90
  5. Step 5: Solve for x
    x = 122,000,147.90/12,421.87
  6. Step 6: Final answer
    x = 9,821.40

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Half scale
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Double scale
Find fourth proportional to 12,422.87, 17,143.03 and 7,118.18
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.