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Finding the Fourth Proportional to 1,121.98, 1,548.16 and 624.62

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Solution

The fourth proportional to 1,121.98, 1,548.16 and 624.62 is: 861.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,121.98 : 1,548.16 = 624.62 : x
  2. Step 2: Convert to fraction form
    1,121.98/1,548.16 = 624.62/x
  3. Step 3: Cross multiply
    1,121.98x = 1,548.16 × 624.62
  4. Step 4: Simplify right side
    1,121.98x = 967,011.70
  5. Step 5: Solve for x
    x = 967,011.70/1,121.98
  6. Step 6: Final answer
    x = 861.88

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.