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Finding the Fourth Proportional to 759.92, 1,139.72 and 212.08

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Solution

The fourth proportional to 759.92, 1,139.72 and 212.08 is: 318.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    759.92 : 1,139.72 = 212.08 : x
  2. Step 2: Convert to fraction form
    759.92/1,139.72 = 212.08/x
  3. Step 3: Cross multiply
    759.92x = 1,139.72 × 212.08
  4. Step 4: Simplify right side
    759.92x = 241,711.82
  5. Step 5: Solve for x
    x = 241,711.82/759.92
  6. Step 6: Final answer
    x = 318.08

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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.