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Finding the Fourth Proportional to 918.71, 1,378.53 and 371.28

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Solution

The fourth proportional to 918.71, 1,378.53 and 371.28 is: 557.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    918.71 : 1,378.53 = 371.28 : x
  2. Step 2: Convert to fraction form
    918.71/1,378.53 = 371.28/x
  3. Step 3: Cross multiply
    918.71x = 1,378.53 × 371.28
  4. Step 4: Simplify right side
    918.71x = 511,820.62
  5. Step 5: Solve for x
    x = 511,820.62/918.71
  6. Step 6: Final answer
    x = 557.11

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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.