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Finding the Fourth Proportional to 657.12, 986.40 and 641.76

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Solution

The fourth proportional to 657.12, 986.40 and 641.76 is: 963.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    657.12 : 986.40 = 641.76 : x
  2. Step 2: Convert to fraction form
    657.12/986.40 = 641.76/x
  3. Step 3: Cross multiply
    657.12x = 986.40 × 641.76
  4. Step 4: Simplify right side
    657.12x = 633,032.06
  5. Step 5: Solve for x
    x = 633,032.06/657.12
  6. Step 6: Final answer
    x = 963.34

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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.