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Finding the Fourth Proportional to 123,419.40, 185,129.10 and 70,931.40

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Solution

The fourth proportional to 123,419.40, 185,129.10 and 70,931.40 is: 106,397.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    123,419.40 : 185,129.10 = 70,931.40 : x
  2. Step 2: Convert to fraction form
    123,419.40/185,129.10 = 70,931.40/x
  3. Step 3: Cross multiply
    123,419.40x = 185,129.10 × 70,931.40
  4. Step 4: Simplify right side
    123,419.40x = 13,131,466,243.74
  5. Step 5: Solve for x
    x = 13,131,466,243.74/123,419.40
  6. Step 6: Final answer
    x = 106,397.10

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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.