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Finding the Fourth Proportional to 939.98, 1,297.18 and 547.02

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Solution

The fourth proportional to 939.98, 1,297.18 and 547.02 is: 754.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    939.98 : 1,297.18 = 547.02 : x
  2. Step 2: Convert to fraction form
    939.98/1,297.18 = 547.02/x
  3. Step 3: Cross multiply
    939.98x = 1,297.18 × 547.02
  4. Step 4: Simplify right side
    939.98x = 709,583.40
  5. Step 5: Solve for x
    x = 709,583.40/939.98
  6. Step 6: Final answer
    x = 754.89

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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.