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Finding the Fourth Proportional to 921.66, 1,272.99 and 672.58

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Solution

The fourth proportional to 921.66, 1,272.99 and 672.58 is: 928.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    921.66 : 1,272.99 = 672.58 : x
  2. Step 2: Convert to fraction form
    921.66/1,272.99 = 672.58/x
  3. Step 3: Cross multiply
    921.66x = 1,272.99 × 672.58
  4. Step 4: Simplify right side
    921.66x = 856,187.61
  5. Step 5: Solve for x
    x = 856,187.61/921.66
  6. Step 6: Final answer
    x = 928.96

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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.