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Finding the Fourth Proportional to 641.70, 886.14 and 511.65

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Solution

The fourth proportional to 641.70, 886.14 and 511.65 is: 706.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    641.70 : 886.14 = 511.65 : x
  2. Step 2: Convert to fraction form
    641.70/886.14 = 511.65/x
  3. Step 3: Cross multiply
    641.70x = 886.14 × 511.65
  4. Step 4: Simplify right side
    641.70x = 453,393.53
  5. Step 5: Solve for x
    x = 453,393.53/641.70
  6. Step 6: Final answer
    x = 706.55

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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.