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Finding the Fourth Proportional to 790.71, 1,091.37 and 511.26

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Solution

The fourth proportional to 790.71, 1,091.37 and 511.26 is: 705.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    790.71 : 1,091.37 = 511.26 : x
  2. Step 2: Convert to fraction form
    790.71/1,091.37 = 511.26/x
  3. Step 3: Cross multiply
    790.71x = 1,091.37 × 511.26
  4. Step 4: Simplify right side
    790.71x = 557,973.83
  5. Step 5: Solve for x
    x = 557,973.83/790.71
  6. Step 6: Final answer
    x = 705.66

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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.