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Finding the Fourth Proportional to 612.66, 844.46 and 487.74

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Solution

The fourth proportional to 612.66, 844.46 and 487.74 is: 672.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    612.66 : 844.46 = 487.74 : x
  2. Step 2: Convert to fraction form
    612.66/844.46 = 487.74/x
  3. Step 3: Cross multiply
    612.66x = 844.46 × 487.74
  4. Step 4: Simplify right side
    612.66x = 411,876.92
  5. Step 5: Solve for x
    x = 411,876.92/612.66
  6. Step 6: Final answer
    x = 672.28

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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.