Home / 1,380.24-2,071.20-918.36

Finding the Fourth Proportional to 1,380.24, 2,071.20 and 918.36

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Solution

The fourth proportional to 1,380.24, 2,071.20 and 918.36 is: 1,378.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,380.24 : 2,071.20 = 918.36 : x
  2. Step 2: Convert to fraction form
    1,380.24/2,071.20 = 918.36/x
  3. Step 3: Cross multiply
    1,380.24x = 2,071.20 × 918.36
  4. Step 4: Simplify right side
    1,380.24x = 1,902,107.23
  5. Step 5: Solve for x
    x = 1,902,107.23/1,380.24
  6. Step 6: Final answer
    x = 1,378.10

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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.