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Finding the Fourth Proportional to 1,031.27, 1,423.32 and 678.23

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Solution

The fourth proportional to 1,031.27, 1,423.32 and 678.23 is: 936.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,031.27 : 1,423.32 = 678.23 : x
  2. Step 2: Convert to fraction form
    1,031.27/1,423.32 = 678.23/x
  3. Step 3: Cross multiply
    1,031.27x = 1,423.32 × 678.23
  4. Step 4: Simplify right side
    1,031.27x = 965,331.21
  5. Step 5: Solve for x
    x = 965,331.21/1,031.27
  6. Step 6: Final answer
    x = 936.06

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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.