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Finding the Fourth Proportional to 774.20, 1,161.56 and 485.84

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Solution

The fourth proportional to 774.20, 1,161.56 and 485.84 is: 728.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    774.20 : 1,161.56 = 485.84 : x
  2. Step 2: Convert to fraction form
    774.20/1,161.56 = 485.84/x
  3. Step 3: Cross multiply
    774.20x = 1,161.56 × 485.84
  4. Step 4: Simplify right side
    774.20x = 564,332.31
  5. Step 5: Solve for x
    x = 564,332.31/774.20
  6. Step 6: Final answer
    x = 728.92

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Double scale
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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.