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Finding the Fourth Proportional to 918.07, 1,376.17 and 456.17

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Solution

The fourth proportional to 918.07, 1,376.17 and 456.17 is: 683.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    918.07 : 1,376.17 = 456.17 : x
  2. Step 2: Convert to fraction form
    918.07/1,376.17 = 456.17/x
  3. Step 3: Cross multiply
    918.07x = 1,376.17 × 456.17
  4. Step 4: Simplify right side
    918.07x = 627,759.45
  5. Step 5: Solve for x
    x = 627,759.45/918.07
  6. Step 6: Final answer
    x = 683.78

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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.