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Finding the Fourth Proportional to 790.38, 1,189.84 and 711

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Solution

The fourth proportional to 790.38, 1,189.84 and 711 is: 1,070.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    790.38 : 1,189.84 = 711 : x
  2. Step 2: Convert to fraction form
    790.38/1,189.84 = 711/x
  3. Step 3: Cross multiply
    790.38x = 1,189.84 × 711
  4. Step 4: Simplify right side
    790.38x = 845,976.24
  5. Step 5: Solve for x
    x = 845,976.24/790.38
  6. Step 6: Final answer
    x = 1,070.34

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.