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Finding the Fourth Proportional to 990.48, 1,487.08 and 503.88

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Solution

The fourth proportional to 990.48, 1,487.08 and 503.88 is: 756.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    990.48 : 1,487.08 = 503.88 : x
  2. Step 2: Convert to fraction form
    990.48/1,487.08 = 503.88/x
  3. Step 3: Cross multiply
    990.48x = 1,487.08 × 503.88
  4. Step 4: Simplify right side
    990.48x = 749,309.87
  5. Step 5: Solve for x
    x = 749,309.87/990.48
  6. Step 6: Final answer
    x = 756.51

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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.