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Finding the Fourth Proportional to 644.95, 966.59 and 558.28

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Solution

The fourth proportional to 644.95, 966.59 and 558.28 is: 836.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    644.95 : 966.59 = 558.28 : x
  2. Step 2: Convert to fraction form
    644.95/966.59 = 558.28/x
  3. Step 3: Cross multiply
    644.95x = 966.59 × 558.28
  4. Step 4: Simplify right side
    644.95x = 539,627.87
  5. Step 5: Solve for x
    x = 539,627.87/644.95
  6. Step 6: Final answer
    x = 836.70

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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.