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Finding the Fourth Proportional to 642.24, 886.32 and 512.19

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Solution

The fourth proportional to 642.24, 886.32 and 512.19 is: 706.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    642.24 : 886.32 = 512.19 : x
  2. Step 2: Convert to fraction form
    642.24/886.32 = 512.19/x
  3. Step 3: Cross multiply
    642.24x = 886.32 × 512.19
  4. Step 4: Simplify right side
    642.24x = 453,964.24
  5. Step 5: Solve for x
    x = 453,964.24/642.24
  6. Step 6: Final answer
    x = 706.85

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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.