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Finding the Fourth Proportional to 691.29, 958.10 and 678.33

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Solution

The fourth proportional to 691.29, 958.10 and 678.33 is: 940.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    691.29 : 958.10 = 678.33 : x
  2. Step 2: Convert to fraction form
    691.29/958.10 = 678.33/x
  3. Step 3: Cross multiply
    691.29x = 958.10 × 678.33
  4. Step 4: Simplify right side
    691.29x = 649,904.58
  5. Step 5: Solve for x
    x = 649,904.58/691.29
  6. Step 6: Final answer
    x = 940.13

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.