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Finding the Fourth Proportional to 580.81, 801.21 and 487.66

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Solution

The fourth proportional to 580.81, 801.21 and 487.66 is: 672.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    580.81 : 801.21 = 487.66 : x
  2. Step 2: Convert to fraction form
    580.81/801.21 = 487.66/x
  3. Step 3: Cross multiply
    580.81x = 801.21 × 487.66
  4. Step 4: Simplify right side
    580.81x = 390,718.07
  5. Step 5: Solve for x
    x = 390,718.07/580.81
  6. Step 6: Final answer
    x = 672.71

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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.