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Finding the Fourth Proportional to 661.52, 992.88 and 621.83

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Solution

The fourth proportional to 661.52, 992.88 and 621.83 is: 933.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    661.52 : 992.88 = 621.83 : x
  2. Step 2: Convert to fraction form
    661.52/992.88 = 621.83/x
  3. Step 3: Cross multiply
    661.52x = 992.88 × 621.83
  4. Step 4: Simplify right side
    661.52x = 617,397.61
  5. Step 5: Solve for x
    x = 617,397.61/661.52
  6. Step 6: Final answer
    x = 933.31

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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.