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Finding the Fourth Proportional to 1,288.55, 1,935.20 and 672.67

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Solution

The fourth proportional to 1,288.55, 1,935.20 and 672.67 is: 1,010.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,288.55 : 1,935.20 = 672.67 : x
  2. Step 2: Convert to fraction form
    1,288.55/1,935.20 = 672.67/x
  3. Step 3: Cross multiply
    1,288.55x = 1,935.20 × 672.67
  4. Step 4: Simplify right side
    1,288.55x = 1,301,747.62
  5. Step 5: Solve for x
    x = 1,301,747.62/1,288.55
  6. Step 6: Final answer
    x = 1,010.24

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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.