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Finding the Fourth Proportional to 865.14, 1,193.67 and 515.58

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Solution

The fourth proportional to 865.14, 1,193.67 and 515.58 is: 711.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    865.14 : 1,193.67 = 515.58 : x
  2. Step 2: Convert to fraction form
    865.14/1,193.67 = 515.58/x
  3. Step 3: Cross multiply
    865.14x = 1,193.67 × 515.58
  4. Step 4: Simplify right side
    865.14x = 615,432.38
  5. Step 5: Solve for x
    x = 615,432.38/865.14
  6. Step 6: Final answer
    x = 711.37

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Double scale
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.