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Finding the Fourth Proportional to 792.34, 1,188.52 and 381.40

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Solution

The fourth proportional to 792.34, 1,188.52 and 381.40 is: 572.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    792.34 : 1,188.52 = 381.40 : x
  2. Step 2: Convert to fraction form
    792.34/1,188.52 = 381.40/x
  3. Step 3: Cross multiply
    792.34x = 1,188.52 × 381.40
  4. Step 4: Simplify right side
    792.34x = 453,301.53
  5. Step 5: Solve for x
    x = 453,301.53/792.34
  6. Step 6: Final answer
    x = 572.10

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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.