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Finding the Fourth Proportional to 715.38, 984.84 and 641.57

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Solution

The fourth proportional to 715.38, 984.84 and 641.57 is: 883.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    715.38 : 984.84 = 641.57 : x
  2. Step 2: Convert to fraction form
    715.38/984.84 = 641.57/x
  3. Step 3: Cross multiply
    715.38x = 984.84 × 641.57
  4. Step 4: Simplify right side
    715.38x = 631,838.87
  5. Step 5: Solve for x
    x = 631,838.87/715.38
  6. Step 6: Final answer
    x = 883.23

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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.