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Finding the Fourth Proportional to 839.79, 1,251.25 and 792.63

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Solution

The fourth proportional to 839.79, 1,251.25 and 792.63 is: 1,180.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    839.79 : 1,251.25 = 792.63 : x
  2. Step 2: Convert to fraction form
    839.79/1,251.25 = 792.63/x
  3. Step 3: Cross multiply
    839.79x = 1,251.25 × 792.63
  4. Step 4: Simplify right side
    839.79x = 991,779.51
  5. Step 5: Solve for x
    x = 991,779.51/839.79
  6. Step 6: Final answer
    x = 1,180.99

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Double scale
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.