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Finding the Fourth Proportional to 890.55, 1,229.40 and 592.20

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Solution

The fourth proportional to 890.55, 1,229.40 and 592.20 is: 817.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    890.55 : 1,229.40 = 592.20 : x
  2. Step 2: Convert to fraction form
    890.55/1,229.40 = 592.20/x
  3. Step 3: Cross multiply
    890.55x = 1,229.40 × 592.20
  4. Step 4: Simplify right side
    890.55x = 728,050.68
  5. Step 5: Solve for x
    x = 728,050.68/890.55
  6. Step 6: Final answer
    x = 817.53

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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.