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Finding the Fourth Proportional to 755.61, 1,040.87 and 657.19

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Solution

The fourth proportional to 755.61, 1,040.87 and 657.19 is: 905.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    755.61 : 1,040.87 = 657.19 : x
  2. Step 2: Convert to fraction form
    755.61/1,040.87 = 657.19/x
  3. Step 3: Cross multiply
    755.61x = 1,040.87 × 657.19
  4. Step 4: Simplify right side
    755.61x = 684,049.36
  5. Step 5: Solve for x
    x = 684,049.36/755.61
  6. Step 6: Final answer
    x = 905.29

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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.