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Finding the Fourth Proportional to 918, 1,378.08 and 765.72

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Solution

The fourth proportional to 918, 1,378.08 and 765.72 is: 1,149.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    918 : 1,378.08 = 765.72 : x
  2. Step 2: Convert to fraction form
    918/1,378.08 = 765.72/x
  3. Step 3: Cross multiply
    918x = 1,378.08 × 765.72
  4. Step 4: Simplify right side
    918x = 1,055,223.42
  5. Step 5: Solve for x
    x = 1,055,223.42/918
  6. Step 6: Final answer
    x = 1,149.48

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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.