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Finding the Fourth Proportional to 1,031.92, 1,424.67 and 678.40

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Solution

The fourth proportional to 1,031.92, 1,424.67 and 678.40 is: 936.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,031.92 : 1,424.67 = 678.40 : x
  2. Step 2: Convert to fraction form
    1,031.92/1,424.67 = 678.40/x
  3. Step 3: Cross multiply
    1,031.92x = 1,424.67 × 678.40
  4. Step 4: Simplify right side
    1,031.92x = 966,496.13
  5. Step 5: Solve for x
    x = 966,496.13/1,031.92
  6. Step 6: Final answer
    x = 936.60

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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.