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Finding the Fourth Proportional to 72,961.47, 100,688.13 and 40,698.90

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Solution

The fourth proportional to 72,961.47, 100,688.13 and 40,698.90 is: 56,165.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,961.47 : 100,688.13 = 40,698.90 : x
  2. Step 2: Convert to fraction form
    72,961.47/100,688.13 = 40,698.90/x
  3. Step 3: Cross multiply
    72,961.47x = 100,688.13 × 40,698.90
  4. Step 4: Simplify right side
    72,961.47x = 4,097,896,134.06
  5. Step 5: Solve for x
    x = 4,097,896,134.06/72,961.47
  6. Step 6: Final answer
    x = 56,165.21

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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.