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Finding the Fourth Proportional to 658.34, 906.66 and 643.99

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Solution

The fourth proportional to 658.34, 906.66 and 643.99 is: 886.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    658.34 : 906.66 = 643.99 : x
  2. Step 2: Convert to fraction form
    658.34/906.66 = 643.99/x
  3. Step 3: Cross multiply
    658.34x = 906.66 × 643.99
  4. Step 4: Simplify right side
    658.34x = 583,875.44
  5. Step 5: Solve for x
    x = 583,875.44/658.34
  6. Step 6: Final answer
    x = 886.89

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Why These Related Problems?

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