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Finding the Fourth Proportional to 400.59, 553.56 and 386.91

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Solution

The fourth proportional to 400.59, 553.56 and 386.91 is: 534.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    400.59 : 553.56 = 386.91 : x
  2. Step 2: Convert to fraction form
    400.59/553.56 = 386.91/x
  3. Step 3: Cross multiply
    400.59x = 553.56 × 386.91
  4. Step 4: Simplify right side
    400.59x = 214,177.90
  5. Step 5: Solve for x
    x = 214,177.90/400.59
  6. Step 6: Final answer
    x = 534.66

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These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.