Home / 103,631.10-155,446.65-72,138.30

Finding the Fourth Proportional to 103,631.10, 155,446.65 and 72,138.30

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Solution

The fourth proportional to 103,631.10, 155,446.65 and 72,138.30 is: 108,207.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    103,631.10 : 155,446.65 = 72,138.30 : x
  2. Step 2: Convert to fraction form
    103,631.10/155,446.65 = 72,138.30/x
  3. Step 3: Cross multiply
    103,631.10x = 155,446.65 × 72,138.30
  4. Step 4: Simplify right side
    103,631.10x = 11,213,657,071.70
  5. Step 5: Solve for x
    x = 11,213,657,071.70/103,631.10
  6. Step 6: Final answer
    x = 108,207.45

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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.