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Finding the Fourth Proportional to 486.71, 671.61 and 290.19

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Solution

The fourth proportional to 486.71, 671.61 and 290.19 is: 400.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    486.71 : 671.61 = 290.19 : x
  2. Step 2: Convert to fraction form
    486.71/671.61 = 290.19/x
  3. Step 3: Cross multiply
    486.71x = 671.61 × 290.19
  4. Step 4: Simplify right side
    486.71x = 194,892.70
  5. Step 5: Solve for x
    x = 194,892.70/486.71
  6. Step 6: Final answer
    x = 400.43

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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.