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Finding the Fourth Proportional to 658.89, 987.94 and 561.44

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Solution

The fourth proportional to 658.89, 987.94 and 561.44 is: 841.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    658.89 : 987.94 = 561.44 : x
  2. Step 2: Convert to fraction form
    658.89/987.94 = 561.44/x
  3. Step 3: Cross multiply
    658.89x = 987.94 × 561.44
  4. Step 4: Simplify right side
    658.89x = 554,669.03
  5. Step 5: Solve for x
    x = 554,669.03/658.89
  6. Step 6: Final answer
    x = 841.82

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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.