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Finding the Fourth Proportional to 1,306.71, 1,960.03 and 319.52

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Solution

The fourth proportional to 1,306.71, 1,960.03 and 319.52 is: 479.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,306.71 : 1,960.03 = 319.52 : x
  2. Step 2: Convert to fraction form
    1,306.71/1,960.03 = 319.52/x
  3. Step 3: Cross multiply
    1,306.71x = 1,960.03 × 319.52
  4. Step 4: Simplify right side
    1,306.71x = 626,274.09
  5. Step 5: Solve for x
    x = 626,274.09/1,306.71
  6. Step 6: Final answer
    x = 479.28

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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.