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Finding the Fourth Proportional to 956.79, 1,436.21 and 847.79

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Solution

The fourth proportional to 956.79, 1,436.21 and 847.79 is: 1,272.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    956.79 : 1,436.21 = 847.79 : x
  2. Step 2: Convert to fraction form
    956.79/1,436.21 = 847.79/x
  3. Step 3: Cross multiply
    956.79x = 1,436.21 × 847.79
  4. Step 4: Simplify right side
    956.79x = 1,217,593.06
  5. Step 5: Solve for x
    x = 1,217,593.06/956.79
  6. Step 6: Final answer
    x = 1,272.58

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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.