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Finding the Fourth Proportional to 755.79, 1,042.92 and 424.20

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Solution

The fourth proportional to 755.79, 1,042.92 and 424.20 is: 585.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    755.79 : 1,042.92 = 424.20 : x
  2. Step 2: Convert to fraction form
    755.79/1,042.92 = 424.20/x
  3. Step 3: Cross multiply
    755.79x = 1,042.92 × 424.20
  4. Step 4: Simplify right side
    755.79x = 442,406.66
  5. Step 5: Solve for x
    x = 442,406.66/755.79
  6. Step 6: Final answer
    x = 585.36

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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.