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Finding the Fourth Proportional to 1,288.46, 1,930.89 and 638.54

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Solution

The fourth proportional to 1,288.46, 1,930.89 and 638.54 is: 956.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,288.46 : 1,930.89 = 638.54 : x
  2. Step 2: Convert to fraction form
    1,288.46/1,930.89 = 638.54/x
  3. Step 3: Cross multiply
    1,288.46x = 1,930.89 × 638.54
  4. Step 4: Simplify right side
    1,288.46x = 1,232,950.50
  5. Step 5: Solve for x
    x = 1,232,950.50/1,288.46
  6. Step 6: Final answer
    x = 956.92

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1.5x scale

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.