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Finding the Fourth Proportional to 1,318.43, 1,977.54 and 393.91

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Solution

The fourth proportional to 1,318.43, 1,977.54 and 393.91 is: 590.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,318.43 : 1,977.54 = 393.91 : x
  2. Step 2: Convert to fraction form
    1,318.43/1,977.54 = 393.91/x
  3. Step 3: Cross multiply
    1,318.43x = 1,977.54 × 393.91
  4. Step 4: Simplify right side
    1,318.43x = 778,978.59
  5. Step 5: Solve for x
    x = 778,978.59/1,318.43
  6. Step 6: Final answer
    x = 590.84

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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.