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Finding the Fourth Proportional to 790.72, 1,091.12 and 495.92

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Solution

The fourth proportional to 790.72, 1,091.12 and 495.92 is: 684.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    790.72 : 1,091.12 = 495.92 : x
  2. Step 2: Convert to fraction form
    790.72/1,091.12 = 495.92/x
  3. Step 3: Cross multiply
    790.72x = 1,091.12 × 495.92
  4. Step 4: Simplify right side
    790.72x = 541,108.23
  5. Step 5: Solve for x
    x = 541,108.23/790.72
  6. Step 6: Final answer
    x = 684.32

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Double scale
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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.