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Finding the Fourth Proportional to 755.78, 1,042.96 and 424.20

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Solution

The fourth proportional to 755.78, 1,042.96 and 424.20 is: 585.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    755.78 : 1,042.96 = 424.20 : x
  2. Step 2: Convert to fraction form
    755.78/1,042.96 = 424.20/x
  3. Step 3: Cross multiply
    755.78x = 1,042.96 × 424.20
  4. Step 4: Simplify right side
    755.78x = 442,423.63
  5. Step 5: Solve for x
    x = 442,423.63/755.78
  6. Step 6: Final answer
    x = 585.39

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Double scale
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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.