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Finding the Fourth Proportional to 758.86, 1,139.46 and 668.32

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Solution

The fourth proportional to 758.86, 1,139.46 and 668.32 is: 1,003.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    758.86 : 1,139.46 = 668.32 : x
  2. Step 2: Convert to fraction form
    758.86/1,139.46 = 668.32/x
  3. Step 3: Cross multiply
    758.86x = 1,139.46 × 668.32
  4. Step 4: Simplify right side
    758.86x = 761,523.91
  5. Step 5: Solve for x
    x = 761,523.91/758.86
  6. Step 6: Final answer
    x = 1,003.51

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.