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Finding the Fourth Proportional to 890.80, 1,229.34 and 497.86

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Solution

The fourth proportional to 890.80, 1,229.34 and 497.86 is: 687.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    890.80 : 1,229.34 = 497.86 : x
  2. Step 2: Convert to fraction form
    890.80/1,229.34 = 497.86/x
  3. Step 3: Cross multiply
    890.80x = 1,229.34 × 497.86
  4. Step 4: Simplify right side
    890.80x = 612,039.21
  5. Step 5: Solve for x
    x = 612,039.21/890.80
  6. Step 6: Final answer
    x = 687.07

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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.