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Finding the Fourth Proportional to 120,549.71, 180,854.63 and 85,080.31

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Solution

The fourth proportional to 120,549.71, 180,854.63 and 85,080.31 is: 127,641.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    120,549.71 : 180,854.63 = 85,080.31 : x
  2. Step 2: Convert to fraction form
    120,549.71/180,854.63 = 85,080.31/x
  3. Step 3: Cross multiply
    120,549.71x = 180,854.63 × 85,080.31
  4. Step 4: Simplify right side
    120,549.71x = 15,387,166,655.66
  5. Step 5: Solve for x
    x = 15,387,166,655.66/120,549.71
  6. Step 6: Final answer
    x = 127,641.68

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.