Home / 1,219.76-1,839.20-1,117.70

Finding the Fourth Proportional to 1,219.76, 1,839.20 and 1,117.70

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Solution

The fourth proportional to 1,219.76, 1,839.20 and 1,117.70 is: 1,685.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,219.76 : 1,839.20 = 1,117.70 : x
  2. Step 2: Convert to fraction form
    1,219.76/1,839.20 = 1,117.70/x
  3. Step 3: Cross multiply
    1,219.76x = 1,839.20 × 1,117.70
  4. Step 4: Simplify right side
    1,219.76x = 2,055,664.64
  5. Step 5: Solve for x
    x = 2,055,664.64/1,219.76
  6. Step 6: Final answer
    x = 1,685.31

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.