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Finding the Fourth Proportional to 890.58, 1,227.80 and 624.66

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Solution

The fourth proportional to 890.58, 1,227.80 and 624.66 is: 861.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    890.58 : 1,227.80 = 624.66 : x
  2. Step 2: Convert to fraction form
    890.58/1,227.80 = 624.66/x
  3. Step 3: Cross multiply
    890.58x = 1,227.80 × 624.66
  4. Step 4: Simplify right side
    890.58x = 766,959.11
  5. Step 5: Solve for x
    x = 766,959.11/890.58
  6. Step 6: Final answer
    x = 861.19

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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.