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Finding the Fourth Proportional to 774.81, 1,162.73 and 287.91

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Solution

The fourth proportional to 774.81, 1,162.73 and 287.91 is: 432.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    774.81 : 1,162.73 = 287.91 : x
  2. Step 2: Convert to fraction form
    774.81/1,162.73 = 287.91/x
  3. Step 3: Cross multiply
    774.81x = 1,162.73 × 287.91
  4. Step 4: Simplify right side
    774.81x = 334,754.34
  5. Step 5: Solve for x
    x = 334,754.34/774.81
  6. Step 6: Final answer
    x = 432.05

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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.