Home / 1,815.20-2,721.70-718.30

Finding the Fourth Proportional to 1,815.20, 2,721.70 and 718.30

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Solution

The fourth proportional to 1,815.20, 2,721.70 and 718.30 is: 1,077.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,815.20 : 2,721.70 = 718.30 : x
  2. Step 2: Convert to fraction form
    1,815.20/2,721.70 = 718.30/x
  3. Step 3: Cross multiply
    1,815.20x = 2,721.70 × 718.30
  4. Step 4: Simplify right side
    1,815.20x = 1,954,997.11
  5. Step 5: Solve for x
    x = 1,954,997.11/1,815.20
  6. Step 6: Final answer
    x = 1,077.01

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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.