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Finding the Fourth Proportional to 672.25, 927.78 and 392.43

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Solution

The fourth proportional to 672.25, 927.78 and 392.43 is: 541.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    672.25 : 927.78 = 392.43 : x
  2. Step 2: Convert to fraction form
    672.25/927.78 = 392.43/x
  3. Step 3: Cross multiply
    672.25x = 927.78 × 392.43
  4. Step 4: Simplify right side
    672.25x = 364,088.71
  5. Step 5: Solve for x
    x = 364,088.71/672.25
  6. Step 6: Final answer
    x = 541.60

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1.5x scale

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.