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Finding the Fourth Proportional to 1,042.66, 1,564.30 and 426.41

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Solution

The fourth proportional to 1,042.66, 1,564.30 and 426.41 is: 639.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,042.66 : 1,564.30 = 426.41 : x
  2. Step 2: Convert to fraction form
    1,042.66/1,564.30 = 426.41/x
  3. Step 3: Cross multiply
    1,042.66x = 1,564.30 × 426.41
  4. Step 4: Simplify right side
    1,042.66x = 667,031.39
  5. Step 5: Solve for x
    x = 667,031.39/1,042.66
  6. Step 6: Final answer
    x = 639.74

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.