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Finding the Fourth Proportional to 287,595.90, 431,356.05 and 87,936.30

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Solution

The fourth proportional to 287,595.90, 431,356.05 and 87,936.30 is: 131,892.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    287,595.90 : 431,356.05 = 87,936.30 : x
  2. Step 2: Convert to fraction form
    287,595.90/431,356.05 = 87,936.30/x
  3. Step 3: Cross multiply
    287,595.90x = 431,356.05 × 87,936.30
  4. Step 4: Simplify right side
    287,595.90x = 37,931,855,019.62
  5. Step 5: Solve for x
    x = 37,931,855,019.62/287,595.90
  6. Step 6: Final answer
    x = 131,892.89

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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.