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Finding the Fourth Proportional to 2,487.36, 3,732.90 and 928.80

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Solution

The fourth proportional to 2,487.36, 3,732.90 and 928.80 is: 1,393.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,487.36 : 3,732.90 = 928.80 : x
  2. Step 2: Convert to fraction form
    2,487.36/3,732.90 = 928.80/x
  3. Step 3: Cross multiply
    2,487.36x = 3,732.90 × 928.80
  4. Step 4: Simplify right side
    2,487.36x = 3,467,117.52
  5. Step 5: Solve for x
    x = 3,467,117.52/2,487.36
  6. Step 6: Final answer
    x = 1,393.89

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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.