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Finding the Fourth Proportional to 890.92, 1,229.59 and 559.79

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Solution

The fourth proportional to 890.92, 1,229.59 and 559.79 is: 772.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    890.92 : 1,229.59 = 559.79 : x
  2. Step 2: Convert to fraction form
    890.92/1,229.59 = 559.79/x
  3. Step 3: Cross multiply
    890.92x = 1,229.59 × 559.79
  4. Step 4: Simplify right side
    890.92x = 688,314.69
  5. Step 5: Solve for x
    x = 688,314.69/890.92
  6. Step 6: Final answer
    x = 772.59

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1.5x scale

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.