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Finding the Fourth Proportional to 691.40, 953.37 and 636.73

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Solution

The fourth proportional to 691.40, 953.37 and 636.73 is: 877.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    691.40 : 953.37 = 636.73 : x
  2. Step 2: Convert to fraction form
    691.40/953.37 = 636.73/x
  3. Step 3: Cross multiply
    691.40x = 953.37 × 636.73
  4. Step 4: Simplify right side
    691.40x = 607,036.90
  5. Step 5: Solve for x
    x = 607,036.90/691.40
  6. Step 6: Final answer
    x = 877.98

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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.