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Finding the Fourth Proportional to 1,317.51, 1,976.31 and 440.09

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Solution

The fourth proportional to 1,317.51, 1,976.31 and 440.09 is: 660.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,317.51 : 1,976.31 = 440.09 : x
  2. Step 2: Convert to fraction form
    1,317.51/1,976.31 = 440.09/x
  3. Step 3: Cross multiply
    1,317.51x = 1,976.31 × 440.09
  4. Step 4: Simplify right side
    1,317.51x = 869,754.27
  5. Step 5: Solve for x
    x = 869,754.27/1,317.51
  6. Step 6: Final answer
    x = 660.15

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1.5x scale

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.