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Finding the Fourth Proportional to 803.07, 1,108.85 and 790.29

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Solution

The fourth proportional to 803.07, 1,108.85 and 790.29 is: 1,091.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    803.07 : 1,108.85 = 790.29 : x
  2. Step 2: Convert to fraction form
    803.07/1,108.85 = 790.29/x
  3. Step 3: Cross multiply
    803.07x = 1,108.85 × 790.29
  4. Step 4: Simplify right side
    803.07x = 876,309.12
  5. Step 5: Solve for x
    x = 876,309.12/803.07
  6. Step 6: Final answer
    x = 1,091.20

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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.