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Finding the Fourth Proportional to 1,031.85, 1,423.47 and 678.36

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Solution

The fourth proportional to 1,031.85, 1,423.47 and 678.36 is: 935.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,031.85 : 1,423.47 = 678.36 : x
  2. Step 2: Convert to fraction form
    1,031.85/1,423.47 = 678.36/x
  3. Step 3: Cross multiply
    1,031.85x = 1,423.47 × 678.36
  4. Step 4: Simplify right side
    1,031.85x = 965,625.11
  5. Step 5: Solve for x
    x = 965,625.11/1,031.85
  6. Step 6: Final answer
    x = 935.82

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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.