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Finding the Fourth Proportional to 553.16, 829.05 and 387.71

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Solution

The fourth proportional to 553.16, 829.05 and 387.71 is: 581.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    553.16 : 829.05 = 387.71 : x
  2. Step 2: Convert to fraction form
    553.16/829.05 = 387.71/x
  3. Step 3: Cross multiply
    553.16x = 829.05 × 387.71
  4. Step 4: Simplify right side
    553.16x = 321,430.98
  5. Step 5: Solve for x
    x = 321,430.98/553.16
  6. Step 6: Final answer
    x = 581.08

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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.