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Finding the Fourth Proportional to 487.12, 672.12 and 356.20

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Solution

The fourth proportional to 487.12, 672.12 and 356.20 is: 491.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    487.12 : 672.12 = 356.20 : x
  2. Step 2: Convert to fraction form
    487.12/672.12 = 356.20/x
  3. Step 3: Cross multiply
    487.12x = 672.12 × 356.20
  4. Step 4: Simplify right side
    487.12x = 239,409.14
  5. Step 5: Solve for x
    x = 239,409.14/487.12
  6. Step 6: Final answer
    x = 491.48

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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.