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Finding the Fourth Proportional to 755.65, 1,042.74 and 424.13

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Solution

The fourth proportional to 755.65, 1,042.74 and 424.13 is: 585.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    755.65 : 1,042.74 = 424.13 : x
  2. Step 2: Convert to fraction form
    755.65/1,042.74 = 424.13/x
  3. Step 3: Cross multiply
    755.65x = 1,042.74 × 424.13
  4. Step 4: Simplify right side
    755.65x = 442,255.36
  5. Step 5: Solve for x
    x = 442,255.36/755.65
  6. Step 6: Final answer
    x = 585.26

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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.