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Finding the Fourth Proportional to 672.51, 928.82 and 639.71

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Solution

The fourth proportional to 672.51, 928.82 and 639.71 is: 883.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    672.51 : 928.82 = 639.71 : x
  2. Step 2: Convert to fraction form
    672.51/928.82 = 639.71/x
  3. Step 3: Cross multiply
    672.51x = 928.82 × 639.71
  4. Step 4: Simplify right side
    672.51x = 594,169.67
  5. Step 5: Solve for x
    x = 594,169.67/672.51
  6. Step 6: Final answer
    x = 883.51

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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.