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Finding the Fourth Proportional to 917.34, 1,377.18 and 765.15

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Solution

The fourth proportional to 917.34, 1,377.18 and 765.15 is: 1,148.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    917.34 : 1,377.18 = 765.15 : x
  2. Step 2: Convert to fraction form
    917.34/1,377.18 = 765.15/x
  3. Step 3: Cross multiply
    917.34x = 1,377.18 × 765.15
  4. Step 4: Simplify right side
    917.34x = 1,053,749.28
  5. Step 5: Solve for x
    x = 1,053,749.28/917.34
  6. Step 6: Final answer
    x = 1,148.70

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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.