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Finding the Fourth Proportional to 951.96, 1,312.86 and 641.88

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Solution

The fourth proportional to 951.96, 1,312.86 and 641.88 is: 885.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    951.96 : 1,312.86 = 641.88 : x
  2. Step 2: Convert to fraction form
    951.96/1,312.86 = 641.88/x
  3. Step 3: Cross multiply
    951.96x = 1,312.86 × 641.88
  4. Step 4: Simplify right side
    951.96x = 842,698.58
  5. Step 5: Solve for x
    x = 842,698.58/951.96
  6. Step 6: Final answer
    x = 885.22

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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.