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Finding the Fourth Proportional to 936.19, 1,405.49 and 719.92

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Solution

The fourth proportional to 936.19, 1,405.49 and 719.92 is: 1,080.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    936.19 : 1,405.49 = 719.92 : x
  2. Step 2: Convert to fraction form
    936.19/1,405.49 = 719.92/x
  3. Step 3: Cross multiply
    936.19x = 1,405.49 × 719.92
  4. Step 4: Simplify right side
    936.19x = 1,011,835.13
  5. Step 5: Solve for x
    x = 1,011,835.13/936.19
  6. Step 6: Final answer
    x = 1,080.81

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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.