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Finding the Fourth Proportional to 739.48, 1,109.28 and 191.66

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Solution

The fourth proportional to 739.48, 1,109.28 and 191.66 is: 287.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    739.48 : 1,109.28 = 191.66 : x
  2. Step 2: Convert to fraction form
    739.48/1,109.28 = 191.66/x
  3. Step 3: Cross multiply
    739.48x = 1,109.28 × 191.66
  4. Step 4: Simplify right side
    739.48x = 212,599.06
  5. Step 5: Solve for x
    x = 212,599.06/739.48
  6. Step 6: Final answer
    x = 287.50

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.