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Finding the Fourth Proportional to 755.88, 1,042.08 and 644.88

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Solution

The fourth proportional to 755.88, 1,042.08 and 644.88 is: 889.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    755.88 : 1,042.08 = 644.88 : x
  2. Step 2: Convert to fraction form
    755.88/1,042.08 = 644.88/x
  3. Step 3: Cross multiply
    755.88x = 1,042.08 × 644.88
  4. Step 4: Simplify right side
    755.88x = 672,016.55
  5. Step 5: Solve for x
    x = 672,016.55/755.88
  6. Step 6: Final answer
    x = 889.05

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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.