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Finding the Fourth Proportional to 790.20, 1,076.13 and 785.34

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Solution

The fourth proportional to 790.20, 1,076.13 and 785.34 is: 1,069.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    790.20 : 1,076.13 = 785.34 : x
  2. Step 2: Convert to fraction form
    790.20/1,076.13 = 785.34/x
  3. Step 3: Cross multiply
    790.20x = 1,076.13 × 785.34
  4. Step 4: Simplify right side
    790.20x = 845,127.93
  5. Step 5: Solve for x
    x = 845,127.93/790.20
  6. Step 6: Final answer
    x = 1,069.51

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Why These Related Problems?

These problems maintain the same ratio (1.36) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.