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Finding the Fourth Proportional to 661.24, 992.04 and 387.52

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Solution

The fourth proportional to 661.24, 992.04 and 387.52 is: 581.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    661.24 : 992.04 = 387.52 : x
  2. Step 2: Convert to fraction form
    661.24/992.04 = 387.52/x
  3. Step 3: Cross multiply
    661.24x = 992.04 × 387.52
  4. Step 4: Simplify right side
    661.24x = 384,433.40
  5. Step 5: Solve for x
    x = 384,433.40/661.24
  6. Step 6: Final answer
    x = 581.38

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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.