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Finding the Fourth Proportional to 918.97, 1,378.64 and 534.13

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Solution

The fourth proportional to 918.97, 1,378.64 and 534.13 is: 801.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    918.97 : 1,378.64 = 534.13 : x
  2. Step 2: Convert to fraction form
    918.97/1,378.64 = 534.13/x
  3. Step 3: Cross multiply
    918.97x = 1,378.64 × 534.13
  4. Step 4: Simplify right side
    918.97x = 736,363.42
  5. Step 5: Solve for x
    x = 736,363.42/918.97
  6. Step 6: Final answer
    x = 801.30

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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.