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Finding the Fourth Proportional to 487.02, 672.48 and 321.60

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Solution

The fourth proportional to 487.02, 672.48 and 321.60 is: 444.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    487.02 : 672.48 = 321.60 : x
  2. Step 2: Convert to fraction form
    487.02/672.48 = 321.60/x
  3. Step 3: Cross multiply
    487.02x = 672.48 × 321.60
  4. Step 4: Simplify right side
    487.02x = 216,269.57
  5. Step 5: Solve for x
    x = 216,269.57/487.02
  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.