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Finding the Fourth Proportional to 72,963.18, 109,400.90 and 28,536.98

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Solution

The fourth proportional to 72,963.18, 109,400.90 and 28,536.98 is: 42,788.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,963.18 : 109,400.90 = 28,536.98 : x
  2. Step 2: Convert to fraction form
    72,963.18/109,400.90 = 28,536.98/x
  3. Step 3: Cross multiply
    72,963.18x = 109,400.90 × 28,536.98
  4. Step 4: Simplify right side
    72,963.18x = 3,121,970,605.59
  5. Step 5: Solve for x
    x = 3,121,970,605.59/72,963.18
  6. Step 6: Final answer
    x = 42,788.30

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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.