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Finding the Fourth Proportional to 1,042.80, 1,564.21 and 426.51

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Solution

The fourth proportional to 1,042.80, 1,564.21 and 426.51 is: 639.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,042.80 : 1,564.21 = 426.51 : x
  2. Step 2: Convert to fraction form
    1,042.80/1,564.21 = 426.51/x
  3. Step 3: Cross multiply
    1,042.80x = 1,564.21 × 426.51
  4. Step 4: Simplify right side
    1,042.80x = 667,150.14
  5. Step 5: Solve for x
    x = 667,150.14/1,042.80
  6. Step 6: Final answer
    x = 639.77

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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.