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Finding the Fourth Proportional to 657.16, 986.78 and 383.46

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Solution

The fourth proportional to 657.16, 986.78 and 383.46 is: 575.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    657.16 : 986.78 = 383.46 : x
  2. Step 2: Convert to fraction form
    657.16/986.78 = 383.46/x
  3. Step 3: Cross multiply
    657.16x = 986.78 × 383.46
  4. Step 4: Simplify right side
    657.16x = 378,390.66
  5. Step 5: Solve for x
    x = 378,390.66/657.16
  6. Step 6: Final answer
    x = 575.80

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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.