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Finding the Fourth Proportional to 657.29, 985.26 and 426.32

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Solution

The fourth proportional to 657.29, 985.26 and 426.32 is: 639.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    657.29 : 985.26 = 426.32 : x
  2. Step 2: Convert to fraction form
    657.29/985.26 = 426.32/x
  3. Step 3: Cross multiply
    657.29x = 985.26 × 426.32
  4. Step 4: Simplify right side
    657.29x = 420,040.11
  5. Step 5: Solve for x
    x = 420,040.11/657.29
  6. Step 6: Final answer
    x = 639.05

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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.