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Finding the Fourth Proportional to 890.55, 1,229.06 and 624.74

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Solution

The fourth proportional to 890.55, 1,229.06 and 624.74 is: 862.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    890.55 : 1,229.06 = 624.74 : x
  2. Step 2: Convert to fraction form
    890.55/1,229.06 = 624.74/x
  3. Step 3: Cross multiply
    890.55x = 1,229.06 × 624.74
  4. Step 4: Simplify right side
    890.55x = 767,833.68
  5. Step 5: Solve for x
    x = 767,833.68/890.55
  6. Step 6: Final answer
    x = 862.20

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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.