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Finding the Fourth Proportional to 1,291.86, 1,937.70 and 426.12

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Solution

The fourth proportional to 1,291.86, 1,937.70 and 426.12 is: 639.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,291.86 : 1,937.70 = 426.12 : x
  2. Step 2: Convert to fraction form
    1,291.86/1,937.70 = 426.12/x
  3. Step 3: Cross multiply
    1,291.86x = 1,937.70 × 426.12
  4. Step 4: Simplify right side
    1,291.86x = 825,692.72
  5. Step 5: Solve for x
    x = 825,692.72/1,291.86
  6. Step 6: Final answer
    x = 639.15

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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.