Home / 1,318.10-1,976.78-440.63

Finding the Fourth Proportional to 1,318.10, 1,976.78 and 440.63

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Solution

The fourth proportional to 1,318.10, 1,976.78 and 440.63 is: 660.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,318.10 : 1,976.78 = 440.63 : x
  2. Step 2: Convert to fraction form
    1,318.10/1,976.78 = 440.63/x
  3. Step 3: Cross multiply
    1,318.10x = 1,976.78 × 440.63
  4. Step 4: Simplify right side
    1,318.10x = 871,023.18
  5. Step 5: Solve for x
    x = 871,023.18/1,318.10
  6. Step 6: Final answer
    x = 660.82

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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.