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Finding the Fourth Proportional to 956.10, 1,434.15 and 851.70

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Solution

The fourth proportional to 956.10, 1,434.15 and 851.70 is: 1,277.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    956.10 : 1,434.15 = 851.70 : x
  2. Step 2: Convert to fraction form
    956.10/1,434.15 = 851.70/x
  3. Step 3: Cross multiply
    956.10x = 1,434.15 × 851.70
  4. Step 4: Simplify right side
    956.10x = 1,221,465.56
  5. Step 5: Solve for x
    x = 1,221,465.56/956.10
  6. Step 6: Final answer
    x = 1,277.55

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.