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Finding the Fourth Proportional to 72,007.16, 99,360 and 40,169.90

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Solution

The fourth proportional to 72,007.16, 99,360 and 40,169.90 is: 55,428.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,007.16 : 99,360 = 40,169.90 : x
  2. Step 2: Convert to fraction form
    72,007.16/99,360 = 40,169.90/x
  3. Step 3: Cross multiply
    72,007.16x = 99,360 × 40,169.90
  4. Step 4: Simplify right side
    72,007.16x = 3,991,281,264
  5. Step 5: Solve for x
    x = 3,991,281,264/72,007.16
  6. Step 6: Final answer
    x = 55,428.95

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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.