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Finding the Fourth Proportional to 89,421.80, 133,979.10 and 42,573.80

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Solution

The fourth proportional to 89,421.80, 133,979.10 and 42,573.80 is: 63,787.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    89,421.80 : 133,979.10 = 42,573.80 : x
  2. Step 2: Convert to fraction form
    89,421.80/133,979.10 = 42,573.80/x
  3. Step 3: Cross multiply
    89,421.80x = 133,979.10 × 42,573.80
  4. Step 4: Simplify right side
    89,421.80x = 5,703,999,407.58
  5. Step 5: Solve for x
    x = 5,703,999,407.58/89,421.80
  6. Step 6: Final answer
    x = 63,787.57

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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.