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Finding the Fourth Proportional to 487.56, 672.66 and 321.87

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Solution

The fourth proportional to 487.56, 672.66 and 321.87 is: 444.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    487.56 : 672.66 = 321.87 : x
  2. Step 2: Convert to fraction form
    487.56/672.66 = 321.87/x
  3. Step 3: Cross multiply
    487.56x = 672.66 × 321.87
  4. Step 4: Simplify right side
    487.56x = 216,509.07
  5. Step 5: Solve for x
    x = 216,509.07/487.56
  6. Step 6: Final answer
    x = 444.07

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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.