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Finding the Fourth Proportional to 2,340.80, 3,230.20 and 1,397.22

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Solution

The fourth proportional to 2,340.80, 3,230.20 and 1,397.22 is: 1,928.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,340.80 : 3,230.20 = 1,397.22 : x
  2. Step 2: Convert to fraction form
    2,340.80/3,230.20 = 1,397.22/x
  3. Step 3: Cross multiply
    2,340.80x = 3,230.20 × 1,397.22
  4. Step 4: Simplify right side
    2,340.80x = 4,513,300.04
  5. Step 5: Solve for x
    x = 4,513,300.04/2,340.80
  6. Step 6: Final answer
    x = 1,928.10

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.