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Finding the Fourth Proportional to 1,031.87, 1,423.56 and 717.39

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Solution

The fourth proportional to 1,031.87, 1,423.56 and 717.39 is: 989.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,031.87 : 1,423.56 = 717.39 : x
  2. Step 2: Convert to fraction form
    1,031.87/1,423.56 = 717.39/x
  3. Step 3: Cross multiply
    1,031.87x = 1,423.56 × 717.39
  4. Step 4: Simplify right side
    1,031.87x = 1,021,247.71
  5. Step 5: Solve for x
    x = 1,021,247.71/1,031.87
  6. Step 6: Final answer
    x = 989.71

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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.