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Finding the Fourth Proportional to 1,206.80, 1,811.40 and 591.20

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Solution

The fourth proportional to 1,206.80, 1,811.40 and 591.20 is: 887.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,206.80 : 1,811.40 = 591.20 : x
  2. Step 2: Convert to fraction form
    1,206.80/1,811.40 = 591.20/x
  3. Step 3: Cross multiply
    1,206.80x = 1,811.40 × 591.20
  4. Step 4: Simplify right side
    1,206.80x = 1,070,899.68
  5. Step 5: Solve for x
    x = 1,070,899.68/1,206.80
  6. Step 6: Final answer
    x = 887.39

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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.