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Finding the Fourth Proportional to 120,428.66, 166,167.60 and 72,684.62

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Solution

The fourth proportional to 120,428.66, 166,167.60 and 72,684.62 is: 100,290.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    120,428.66 : 166,167.60 = 72,684.62 : x
  2. Step 2: Convert to fraction form
    120,428.66/166,167.60 = 72,684.62/x
  3. Step 3: Cross multiply
    120,428.66x = 166,167.60 × 72,684.62
  4. Step 4: Simplify right side
    120,428.66x = 12,077,828,862.31
  5. Step 5: Solve for x
    x = 12,077,828,862.31/120,428.66
  6. Step 6: Final answer
    x = 100,290.32

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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.