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Finding the Fourth Proportional to 956.24, 1,318.40 and 690.56

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Solution

The fourth proportional to 956.24, 1,318.40 and 690.56 is: 952.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    956.24 : 1,318.40 = 690.56 : x
  2. Step 2: Convert to fraction form
    956.24/1,318.40 = 690.56/x
  3. Step 3: Cross multiply
    956.24x = 1,318.40 × 690.56
  4. Step 4: Simplify right side
    956.24x = 910,434.30
  5. Step 5: Solve for x
    x = 910,434.30/956.24
  6. Step 6: Final answer
    x = 952.10

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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.