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Finding the Fourth Proportional to 774.32, 1,155.94 and 747.32

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Solution

The fourth proportional to 774.32, 1,155.94 and 747.32 is: 1,115.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    774.32 : 1,155.94 = 747.32 : x
  2. Step 2: Convert to fraction form
    774.32/1,155.94 = 747.32/x
  3. Step 3: Cross multiply
    774.32x = 1,155.94 × 747.32
  4. Step 4: Simplify right side
    774.32x = 863,857.08
  5. Step 5: Solve for x
    x = 863,857.08/774.32
  6. Step 6: Final answer
    x = 1,115.63

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.