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Finding the Fourth Proportional to 755.58, 1,042.49 and 490.10

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Solution

The fourth proportional to 755.58, 1,042.49 and 490.10 is: 676.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    755.58 : 1,042.49 = 490.10 : x
  2. Step 2: Convert to fraction form
    755.58/1,042.49 = 490.10/x
  3. Step 3: Cross multiply
    755.58x = 1,042.49 × 490.10
  4. Step 4: Simplify right side
    755.58x = 510,916.69
  5. Step 5: Solve for x
    x = 510,916.69/755.58
  6. Step 6: Final answer
    x = 676.19

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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.