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Finding the Fourth Proportional to 72,999.31, 100,715.46 and 40,728.70

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Solution

The fourth proportional to 72,999.31, 100,715.46 and 40,728.70 is: 56,192.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,999.31 : 100,715.46 = 40,728.70 : x
  2. Step 2: Convert to fraction form
    72,999.31/100,715.46 = 40,728.70/x
  3. Step 3: Cross multiply
    72,999.31x = 100,715.46 × 40,728.70
  4. Step 4: Simplify right side
    72,999.31x = 4,102,009,503.91
  5. Step 5: Solve for x
    x = 4,102,009,503.91/72,999.31
  6. Step 6: Final answer
    x = 56,192.44

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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.