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Finding the Fourth Proportional to 1,306.42, 1,959.63 and 319.25

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Solution

The fourth proportional to 1,306.42, 1,959.63 and 319.25 is: 478.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,306.42 : 1,959.63 = 319.25 : x
  2. Step 2: Convert to fraction form
    1,306.42/1,959.63 = 319.25/x
  3. Step 3: Cross multiply
    1,306.42x = 1,959.63 × 319.25
  4. Step 4: Simplify right side
    1,306.42x = 625,602.47
  5. Step 5: Solve for x
    x = 625,602.47/1,306.42
  6. Step 6: Final answer
    x = 478.87

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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.