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Finding the Fourth Proportional to 1,319.28, 1,978.08 and 453.42

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Solution

The fourth proportional to 1,319.28, 1,978.08 and 453.42 is: 679.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,319.28 : 1,978.08 = 453.42 : x
  2. Step 2: Convert to fraction form
    1,319.28/1,978.08 = 453.42/x
  3. Step 3: Cross multiply
    1,319.28x = 1,978.08 × 453.42
  4. Step 4: Simplify right side
    1,319.28x = 896,901.03
  5. Step 5: Solve for x
    x = 896,901.03/1,319.28
  6. Step 6: Final answer
    x = 679.84

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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.