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Finding the Fourth Proportional to 3,089.80, 4,634.70 and 781.30

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Solution

The fourth proportional to 3,089.80, 4,634.70 and 781.30 is: 1,171.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,089.80 : 4,634.70 = 781.30 : x
  2. Step 2: Convert to fraction form
    3,089.80/4,634.70 = 781.30/x
  3. Step 3: Cross multiply
    3,089.80x = 4,634.70 × 781.30
  4. Step 4: Simplify right side
    3,089.80x = 3,621,091.11
  5. Step 5: Solve for x
    x = 3,621,091.11/3,089.80
  6. Step 6: Final answer
    x = 1,171.95

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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.