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Finding the Fourth Proportional to 689.95, 1,034.79 and 319.74

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Solution

The fourth proportional to 689.95, 1,034.79 and 319.74 is: 479.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    689.95 : 1,034.79 = 319.74 : x
  2. Step 2: Convert to fraction form
    689.95/1,034.79 = 319.74/x
  3. Step 3: Cross multiply
    689.95x = 1,034.79 × 319.74
  4. Step 4: Simplify right side
    689.95x = 330,856.98
  5. Step 5: Solve for x
    x = 330,856.98/689.95
  6. Step 6: Final answer
    x = 479.54

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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.