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Finding the Fourth Proportional to 287,573.76, 431,379 and 87,901.20

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Solution

The fourth proportional to 287,573.76, 431,379 and 87,901.20 is: 131,857.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    287,573.76 : 431,379 = 87,901.20 : x
  2. Step 2: Convert to fraction form
    287,573.76/431,379 = 87,901.20/x
  3. Step 3: Cross multiply
    287,573.76x = 431,379 × 87,901.20
  4. Step 4: Simplify right side
    287,573.76x = 37,918,731,754.80
  5. Step 5: Solve for x
    x = 37,918,731,754.80/287,573.76
  6. Step 6: Final answer
    x = 131,857.41

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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.