Home / 12,420.60-17,141.40-7,116.72

Finding the Fourth Proportional to 12,420.60, 17,141.40 and 7,116.72

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Solution

The fourth proportional to 12,420.60, 17,141.40 and 7,116.72 is: 9,821.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,420.60 : 17,141.40 = 7,116.72 : x
  2. Step 2: Convert to fraction form
    12,420.60/17,141.40 = 7,116.72/x
  3. Step 3: Cross multiply
    12,420.60x = 17,141.40 × 7,116.72
  4. Step 4: Simplify right side
    12,420.60x = 121,990,544.21
  5. Step 5: Solve for x
    x = 121,990,544.21/12,420.60
  6. Step 6: Final answer
    x = 9,821.63

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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.