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Finding the Fourth Proportional to 955.44, 1,318.50 and 690.39

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Solution

The fourth proportional to 955.44, 1,318.50 and 690.39 is: 952.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    955.44 : 1,318.50 = 690.39 : x
  2. Step 2: Convert to fraction form
    955.44/1,318.50 = 690.39/x
  3. Step 3: Cross multiply
    955.44x = 1,318.50 × 690.39
  4. Step 4: Simplify right side
    955.44x = 910,279.22
  5. Step 5: Solve for x
    x = 910,279.22/955.44
  6. Step 6: Final answer
    x = 952.73

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Double scale
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1.5x scale

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.