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Finding the Fourth Proportional to 809.38, 1,117.20 and 477.88

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Solution

The fourth proportional to 809.38, 1,117.20 and 477.88 is: 659.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    809.38 : 1,117.20 = 477.88 : x
  2. Step 2: Convert to fraction form
    809.38/1,117.20 = 477.88/x
  3. Step 3: Cross multiply
    809.38x = 1,117.20 × 477.88
  4. Step 4: Simplify right side
    809.38x = 533,887.54
  5. Step 5: Solve for x
    x = 533,887.54/809.38
  6. Step 6: Final answer
    x = 659.63

Related Problems

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Half scale
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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.