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Finding the Fourth Proportional to 890.91, 1,229.61 and 655.20

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Solution

The fourth proportional to 890.91, 1,229.61 and 655.20 is: 904.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    890.91 : 1,229.61 = 655.20 : x
  2. Step 2: Convert to fraction form
    890.91/1,229.61 = 655.20/x
  3. Step 3: Cross multiply
    890.91x = 1,229.61 × 655.20
  4. Step 4: Simplify right side
    890.91x = 805,642.93
  5. Step 5: Solve for x
    x = 805,642.93/890.91
  6. Step 6: Final answer
    x = 904.29

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