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Finding the Fourth Proportional to 890.79, 1,229.34 and 497.83

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Solution

The fourth proportional to 890.79, 1,229.34 and 497.83 is: 687.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    890.79 : 1,229.34 = 497.83 : x
  2. Step 2: Convert to fraction form
    890.79/1,229.34 = 497.83/x
  3. Step 3: Cross multiply
    890.79x = 1,229.34 × 497.83
  4. Step 4: Simplify right side
    890.79x = 612,002.33
  5. Step 5: Solve for x
    x = 612,002.33/890.79
  6. Step 6: Final answer
    x = 687.03

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Double scale
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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.