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Finding the Fourth Proportional to 3,891.65, 5,836.59 and 1,118.30

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Solution

The fourth proportional to 3,891.65, 5,836.59 and 1,118.30 is: 1,677.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,891.65 : 5,836.59 = 1,118.30 : x
  2. Step 2: Convert to fraction form
    3,891.65/5,836.59 = 1,118.30/x
  3. Step 3: Cross multiply
    3,891.65x = 5,836.59 × 1,118.30
  4. Step 4: Simplify right side
    3,891.65x = 6,527,058.60
  5. Step 5: Solve for x
    x = 6,527,058.60/3,891.65
  6. Step 6: Final answer
    x = 1,677.20

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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.