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Finding the Fourth Proportional to 918.17, 1,376.49 and 658.13

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Solution

The fourth proportional to 918.17, 1,376.49 and 658.13 is: 986.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    918.17 : 1,376.49 = 658.13 : x
  2. Step 2: Convert to fraction form
    918.17/1,376.49 = 658.13/x
  3. Step 3: Cross multiply
    918.17x = 1,376.49 × 658.13
  4. Step 4: Simplify right side
    918.17x = 905,904.95
  5. Step 5: Solve for x
    x = 905,904.95/918.17
  6. Step 6: Final answer
    x = 986.64

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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.