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Finding the Fourth Proportional to 72,395.96, 99,905.46 and 40,565.48

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Solution

The fourth proportional to 72,395.96, 99,905.46 and 40,565.48 is: 55,979.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,395.96 : 99,905.46 = 40,565.48 : x
  2. Step 2: Convert to fraction form
    72,395.96/99,905.46 = 40,565.48/x
  3. Step 3: Cross multiply
    72,395.96x = 99,905.46 × 40,565.48
  4. Step 4: Simplify right side
    72,395.96x = 4,052,712,939.52
  5. Step 5: Solve for x
    x = 4,052,712,939.52/72,395.96
  6. Step 6: Final answer
    x = 55,979.82

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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.