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Finding the Fourth Proportional to 959.16, 1,324.08 and 679.64

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Solution

The fourth proportional to 959.16, 1,324.08 and 679.64 is: 938.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    959.16 : 1,324.08 = 679.64 : x
  2. Step 2: Convert to fraction form
    959.16/1,324.08 = 679.64/x
  3. Step 3: Cross multiply
    959.16x = 1,324.08 × 679.64
  4. Step 4: Simplify right side
    959.16x = 899,897.73
  5. Step 5: Solve for x
    x = 899,897.73/959.16
  6. Step 6: Final answer
    x = 938.21

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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.