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Finding the Fourth Proportional to 809.46, 1,117.31 and 631.89

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Solution

The fourth proportional to 809.46, 1,117.31 and 631.89 is: 872.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    809.46 : 1,117.31 = 631.89 : x
  2. Step 2: Convert to fraction form
    809.46/1,117.31 = 631.89/x
  3. Step 3: Cross multiply
    809.46x = 1,117.31 × 631.89
  4. Step 4: Simplify right side
    809.46x = 706,017.02
  5. Step 5: Solve for x
    x = 706,017.02/809.46
  6. Step 6: Final answer
    x = 872.21

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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.