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Finding the Fourth Proportional to 1,162.78, 1,604.64 and 638.85

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Solution

The fourth proportional to 1,162.78, 1,604.64 and 638.85 is: 881.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,162.78 : 1,604.64 = 638.85 : x
  2. Step 2: Convert to fraction form
    1,162.78/1,604.64 = 638.85/x
  3. Step 3: Cross multiply
    1,162.78x = 1,604.64 × 638.85
  4. Step 4: Simplify right side
    1,162.78x = 1,025,117.45
  5. Step 5: Solve for x
    x = 1,025,117.45/1,162.78
  6. Step 6: Final answer
    x = 881.61

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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.