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Finding the Fourth Proportional to 779.31, 1,074.80 and 702.51

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Solution

The fourth proportional to 779.31, 1,074.80 and 702.51 is: 968.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    779.31 : 1,074.80 = 702.51 : x
  2. Step 2: Convert to fraction form
    779.31/1,074.80 = 702.51/x
  3. Step 3: Cross multiply
    779.31x = 1,074.80 × 702.51
  4. Step 4: Simplify right side
    779.31x = 755,054.24
  5. Step 5: Solve for x
    x = 755,054.24/779.31
  6. Step 6: Final answer
    x = 968.88

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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.