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Finding the Fourth Proportional to 1,049.78, 1,574.46 and 319.34

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Solution

The fourth proportional to 1,049.78, 1,574.46 and 319.34 is: 478.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,049.78 : 1,574.46 = 319.34 : x
  2. Step 2: Convert to fraction form
    1,049.78/1,574.46 = 319.34/x
  3. Step 3: Cross multiply
    1,049.78x = 1,574.46 × 319.34
  4. Step 4: Simplify right side
    1,049.78x = 502,788.06
  5. Step 5: Solve for x
    x = 502,788.06/1,049.78
  6. Step 6: Final answer
    x = 478.95

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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.