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Finding the Fourth Proportional to 1,288.68, 1,932.99 and 314.78

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Solution

The fourth proportional to 1,288.68, 1,932.99 and 314.78 is: 472.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,288.68 : 1,932.99 = 314.78 : x
  2. Step 2: Convert to fraction form
    1,288.68/1,932.99 = 314.78/x
  3. Step 3: Cross multiply
    1,288.68x = 1,932.99 × 314.78
  4. Step 4: Simplify right side
    1,288.68x = 608,455.35
  5. Step 5: Solve for x
    x = 608,455.35/1,288.68
  6. Step 6: Final answer
    x = 472.16

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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.