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Finding the Fourth Proportional to 72,914.78, 109,381.28 and 28,535.80

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Solution

The fourth proportional to 72,914.78, 109,381.28 and 28,535.80 is: 42,807.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,914.78 : 109,381.28 = 28,535.80 : x
  2. Step 2: Convert to fraction form
    72,914.78/109,381.28 = 28,535.80/x
  3. Step 3: Cross multiply
    72,914.78x = 109,381.28 × 28,535.80
  4. Step 4: Simplify right side
    72,914.78x = 3,121,282,329.82
  5. Step 5: Solve for x
    x = 3,121,282,329.82/72,914.78
  6. Step 6: Final answer
    x = 42,807.27

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.