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Finding the Fourth Proportional to 918.36, 1,380 and 915.96

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Solution

The fourth proportional to 918.36, 1,380 and 915.96 is: 1,376.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    918.36 : 1,380 = 915.96 : x
  2. Step 2: Convert to fraction form
    918.36/1,380 = 915.96/x
  3. Step 3: Cross multiply
    918.36x = 1,380 × 915.96
  4. Step 4: Simplify right side
    918.36x = 1,264,024.80
  5. Step 5: Solve for x
    x = 1,264,024.80/918.36
  6. Step 6: Final answer
    x = 1,376.39

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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.