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Finding the Fourth Proportional to 72,572.40, 100,143 and 40,734

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Solution

The fourth proportional to 72,572.40, 100,143 and 40,734 is: 56,209.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,572.40 : 100,143 = 40,734 : x
  2. Step 2: Convert to fraction form
    72,572.40/100,143 = 40,734/x
  3. Step 3: Cross multiply
    72,572.40x = 100,143 × 40,734
  4. Step 4: Simplify right side
    72,572.40x = 4,079,224,962
  5. Step 5: Solve for x
    x = 4,079,224,962/72,572.40
  6. Step 6: Final answer
    x = 56,209.04

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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.