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Finding the Fourth Proportional to 956.76, 1,318.80 and 790.68

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Solution

The fourth proportional to 956.76, 1,318.80 and 790.68 is: 1,089.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    956.76 : 1,318.80 = 790.68 : x
  2. Step 2: Convert to fraction form
    956.76/1,318.80 = 790.68/x
  3. Step 3: Cross multiply
    956.76x = 1,318.80 × 790.68
  4. Step 4: Simplify right side
    956.76x = 1,042,748.78
  5. Step 5: Solve for x
    x = 1,042,748.78/956.76
  6. Step 6: Final answer
    x = 1,089.87

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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.