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Finding the Fourth Proportional to 772.38, 1,158.21 and 387.18

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Solution

The fourth proportional to 772.38, 1,158.21 and 387.18 is: 580.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    772.38 : 1,158.21 = 387.18 : x
  2. Step 2: Convert to fraction form
    772.38/1,158.21 = 387.18/x
  3. Step 3: Cross multiply
    772.38x = 1,158.21 × 387.18
  4. Step 4: Simplify right side
    772.38x = 448,435.75
  5. Step 5: Solve for x
    x = 448,435.75/772.38
  6. Step 6: Final answer
    x = 580.59

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Double scale
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1.5x scale

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.