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Finding the Fourth Proportional to 456.32, 687.93 and 426.60

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Solution

The fourth proportional to 456.32, 687.93 and 426.60 is: 643.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    456.32 : 687.93 = 426.60 : x
  2. Step 2: Convert to fraction form
    456.32/687.93 = 426.60/x
  3. Step 3: Cross multiply
    456.32x = 687.93 × 426.60
  4. Step 4: Simplify right side
    456.32x = 293,470.94
  5. Step 5: Solve for x
    x = 293,470.94/456.32
  6. Step 6: Final answer
    x = 643.13

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.