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Finding the Fourth Proportional to 1,318.85, 1,978.23 and 453.16

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Solution

The fourth proportional to 1,318.85, 1,978.23 and 453.16 is: 679.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,318.85 : 1,978.23 = 453.16 : x
  2. Step 2: Convert to fraction form
    1,318.85/1,978.23 = 453.16/x
  3. Step 3: Cross multiply
    1,318.85x = 1,978.23 × 453.16
  4. Step 4: Simplify right side
    1,318.85x = 896,454.71
  5. Step 5: Solve for x
    x = 896,454.71/1,318.85
  6. Step 6: Final answer
    x = 679.72

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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.