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Finding the Fourth Proportional to 698.76, 1,047.90 and 503.18

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Solution

The fourth proportional to 698.76, 1,047.90 and 503.18 is: 754.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    698.76 : 1,047.90 = 503.18 : x
  2. Step 2: Convert to fraction form
    698.76/1,047.90 = 503.18/x
  3. Step 3: Cross multiply
    698.76x = 1,047.90 × 503.18
  4. Step 4: Simplify right side
    698.76x = 527,282.32
  5. Step 5: Solve for x
    x = 527,282.32/698.76
  6. Step 6: Final answer
    x = 754.60

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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.