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Finding the Fourth Proportional to 487.55, 672.90 and 291.03

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Solution

The fourth proportional to 487.55, 672.90 and 291.03 is: 401.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    487.55 : 672.90 = 291.03 : x
  2. Step 2: Convert to fraction form
    487.55/672.90 = 291.03/x
  3. Step 3: Cross multiply
    487.55x = 672.90 × 291.03
  4. Step 4: Simplify right side
    487.55x = 195,830.47
  5. Step 5: Solve for x
    x = 195,830.47/487.55
  6. Step 6: Final answer
    x = 401.66

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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.