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Finding the Fourth Proportional to 990.43, 1,486.15 and 503.48

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Solution

The fourth proportional to 990.43, 1,486.15 and 503.48 is: 755.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    990.43 : 1,486.15 = 503.48 : x
  2. Step 2: Convert to fraction form
    990.43/1,486.15 = 503.48/x
  3. Step 3: Cross multiply
    990.43x = 1,486.15 × 503.48
  4. Step 4: Simplify right side
    990.43x = 748,249.26
  5. Step 5: Solve for x
    x = 748,249.26/990.43
  6. Step 6: Final answer
    x = 755.48

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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.