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Finding the Fourth Proportional to 779.74, 1,075.62 and 670.66

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Solution

The fourth proportional to 779.74, 1,075.62 and 670.66 is: 925.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    779.74 : 1,075.62 = 670.66 : x
  2. Step 2: Convert to fraction form
    779.74/1,075.62 = 670.66/x
  3. Step 3: Cross multiply
    779.74x = 1,075.62 × 670.66
  4. Step 4: Simplify right side
    779.74x = 721,375.31
  5. Step 5: Solve for x
    x = 721,375.31/779.74
  6. Step 6: Final answer
    x = 925.15

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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.