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Finding the Fourth Proportional to 89,420.80, 133,977.60 and 42,572.80

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Solution

The fourth proportional to 89,420.80, 133,977.60 and 42,572.80 is: 63,786.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    89,420.80 : 133,977.60 = 42,572.80 : x
  2. Step 2: Convert to fraction form
    89,420.80/133,977.60 = 42,572.80/x
  3. Step 3: Cross multiply
    89,420.80x = 133,977.60 × 42,572.80
  4. Step 4: Simplify right side
    89,420.80x = 5,703,801,569.28
  5. Step 5: Solve for x
    x = 5,703,801,569.28/89,420.80
  6. Step 6: Final answer
    x = 63,786.07

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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.