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Finding the Fourth Proportional to 1,317.77, 1,976.95 and 440.32

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Solution

The fourth proportional to 1,317.77, 1,976.95 and 440.32 is: 660.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,317.77 : 1,976.95 = 440.32 : x
  2. Step 2: Convert to fraction form
    1,317.77/1,976.95 = 440.32/x
  3. Step 3: Cross multiply
    1,317.77x = 1,976.95 × 440.32
  4. Step 4: Simplify right side
    1,317.77x = 870,480.74
  5. Step 5: Solve for x
    x = 870,480.74/1,317.77
  6. Step 6: Final answer
    x = 660.57

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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.