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Finding the Fourth Proportional to 990.97, 1,485.36 and 503.02

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Solution

The fourth proportional to 990.97, 1,485.36 and 503.02 is: 753.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    990.97 : 1,485.36 = 503.02 : x
  2. Step 2: Convert to fraction form
    990.97/1,485.36 = 503.02/x
  3. Step 3: Cross multiply
    990.97x = 1,485.36 × 503.02
  4. Step 4: Simplify right side
    990.97x = 747,155.85
  5. Step 5: Solve for x
    x = 747,155.85/990.97
  6. Step 6: Final answer
    x = 753.96

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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.