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Finding the Fourth Proportional to 956.58, 1,326.79 and 917.70

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Solution

The fourth proportional to 956.58, 1,326.79 and 917.70 is: 1,272.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    956.58 : 1,326.79 = 917.70 : x
  2. Step 2: Convert to fraction form
    956.58/1,326.79 = 917.70/x
  3. Step 3: Cross multiply
    956.58x = 1,326.79 × 917.70
  4. Step 4: Simplify right side
    956.58x = 1,217,595.18
  5. Step 5: Solve for x
    x = 1,217,595.18/956.58
  6. Step 6: Final answer
    x = 1,272.86

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.