Home / 1,380.70-2,061.40-1,172.32

Finding the Fourth Proportional to 1,380.70, 2,061.40 and 1,172.32

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Solution

The fourth proportional to 1,380.70, 2,061.40 and 1,172.32 is: 1,750.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,380.70 : 2,061.40 = 1,172.32 : x
  2. Step 2: Convert to fraction form
    1,380.70/2,061.40 = 1,172.32/x
  3. Step 3: Cross multiply
    1,380.70x = 2,061.40 × 1,172.32
  4. Step 4: Simplify right side
    1,380.70x = 2,416,626.16
  5. Step 5: Solve for x
    x = 2,416,626.16/1,380.70
  6. Step 6: Final answer
    x = 1,750.30

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.