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Finding the Fourth Proportional to 1,317.87, 1,977.18 and 393.47

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Solution

The fourth proportional to 1,317.87, 1,977.18 and 393.47 is: 590.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,317.87 : 1,977.18 = 393.47 : x
  2. Step 2: Convert to fraction form
    1,317.87/1,977.18 = 393.47/x
  3. Step 3: Cross multiply
    1,317.87x = 1,977.18 × 393.47
  4. Step 4: Simplify right side
    1,317.87x = 777,951.13
  5. Step 5: Solve for x
    x = 777,951.13/1,317.87
  6. Step 6: Final answer
    x = 590.31

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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.