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Finding the Fourth Proportional to 657.66, 987.06 and 383.38

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Solution

The fourth proportional to 657.66, 987.06 and 383.38 is: 575.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    657.66 : 987.06 = 383.38 : x
  2. Step 2: Convert to fraction form
    657.66/987.06 = 383.38/x
  3. Step 3: Cross multiply
    657.66x = 987.06 × 383.38
  4. Step 4: Simplify right side
    657.66x = 378,419.06
  5. Step 5: Solve for x
    x = 378,419.06/657.66
  6. Step 6: Final answer
    x = 575.40

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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.