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Finding the Fourth Proportional to 72,723.90, 109,004.85 and 28,335.90

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Solution

The fourth proportional to 72,723.90, 109,004.85 and 28,335.90 is: 42,472.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,723.90 : 109,004.85 = 28,335.90 : x
  2. Step 2: Convert to fraction form
    72,723.90/109,004.85 = 28,335.90/x
  3. Step 3: Cross multiply
    72,723.90x = 109,004.85 × 28,335.90
  4. Step 4: Simplify right side
    72,723.90x = 3,088,750,529.12
  5. Step 5: Solve for x
    x = 3,088,750,529.12/72,723.90
  6. Step 6: Final answer
    x = 42,472.29

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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.