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Finding the Fourth Proportional to 486.64, 672.78 and 474.58

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Solution

The fourth proportional to 486.64, 672.78 and 474.58 is: 656.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    486.64 : 672.78 = 474.58 : x
  2. Step 2: Convert to fraction form
    486.64/672.78 = 474.58/x
  3. Step 3: Cross multiply
    486.64x = 672.78 × 474.58
  4. Step 4: Simplify right side
    486.64x = 319,287.93
  5. Step 5: Solve for x
    x = 319,287.93/486.64
  6. Step 6: Final answer
    x = 656.11

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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.