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Finding the Fourth Proportional to 486.81, 672.12 and 356.13

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Solution

The fourth proportional to 486.81, 672.12 and 356.13 is: 491.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    486.81 : 672.12 = 356.13 : x
  2. Step 2: Convert to fraction form
    486.81/672.12 = 356.13/x
  3. Step 3: Cross multiply
    486.81x = 672.12 × 356.13
  4. Step 4: Simplify right side
    486.81x = 239,362.10
  5. Step 5: Solve for x
    x = 239,362.10/486.81
  6. Step 6: Final answer
    x = 491.70

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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.