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Finding the Fourth Proportional to 99,568.53, 137,312.28 and 72,668.43

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Solution

The fourth proportional to 99,568.53, 137,312.28 and 72,668.43 is: 100,215.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    99,568.53 : 137,312.28 = 72,668.43 : x
  2. Step 2: Convert to fraction form
    99,568.53/137,312.28 = 72,668.43/x
  3. Step 3: Cross multiply
    99,568.53x = 137,312.28 × 72,668.43
  4. Step 4: Simplify right side
    99,568.53x = 9,978,267,807.32
  5. Step 5: Solve for x
    x = 9,978,267,807.32/99,568.53
  6. Step 6: Final answer
    x = 100,215.08

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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.