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Finding the Fourth Proportional to 956.39, 1,319.19 and 690.39

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Solution

The fourth proportional to 956.39, 1,319.19 and 690.39 is: 952.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    956.39 : 1,319.19 = 690.39 : x
  2. Step 2: Convert to fraction form
    956.39/1,319.19 = 690.39/x
  3. Step 3: Cross multiply
    956.39x = 1,319.19 × 690.39
  4. Step 4: Simplify right side
    956.39x = 910,753.00
  5. Step 5: Solve for x
    x = 910,753.00/956.39
  6. Step 6: Final answer
    x = 952.29

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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.