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Finding the Fourth Proportional to 1,289.28, 1,933.89 and 315.39

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Solution

The fourth proportional to 1,289.28, 1,933.89 and 315.39 is: 473.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,289.28 : 1,933.89 = 315.39 : x
  2. Step 2: Convert to fraction form
    1,289.28/1,933.89 = 315.39/x
  3. Step 3: Cross multiply
    1,289.28x = 1,933.89 × 315.39
  4. Step 4: Simplify right side
    1,289.28x = 609,929.57
  5. Step 5: Solve for x
    x = 609,929.57/1,289.28
  6. Step 6: Final answer
    x = 473.08

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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.