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Finding the Fourth Proportional to 2,287.80, 3,430.90 and 1,191.80

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Solution

The fourth proportional to 2,287.80, 3,430.90 and 1,191.80 is: 1,787.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,287.80 : 3,430.90 = 1,191.80 : x
  2. Step 2: Convert to fraction form
    2,287.80/3,430.90 = 1,191.80/x
  3. Step 3: Cross multiply
    2,287.80x = 3,430.90 × 1,191.80
  4. Step 4: Simplify right side
    2,287.80x = 4,088,946.62
  5. Step 5: Solve for x
    x = 4,088,946.62/2,287.80
  6. Step 6: Final answer
    x = 1,787.28

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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.