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Finding the Fourth Proportional to 792.40, 1,187.46 and 426.46

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Solution

The fourth proportional to 792.40, 1,187.46 and 426.46 is: 639.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    792.40 : 1,187.46 = 426.46 : x
  2. Step 2: Convert to fraction form
    792.40/1,187.46 = 426.46/x
  3. Step 3: Cross multiply
    792.40x = 1,187.46 × 426.46
  4. Step 4: Simplify right side
    792.40x = 506,404.19
  5. Step 5: Solve for x
    x = 506,404.19/792.40
  6. Step 6: Final answer
    x = 639.08

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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.