Home / 1,396.40-1,921.36-1,209.32

Finding the Fourth Proportional to 1,396.40, 1,921.36 and 1,209.32

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Solution

The fourth proportional to 1,396.40, 1,921.36 and 1,209.32 is: 1,663.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,396.40 : 1,921.36 = 1,209.32 : x
  2. Step 2: Convert to fraction form
    1,396.40/1,921.36 = 1,209.32/x
  3. Step 3: Cross multiply
    1,396.40x = 1,921.36 × 1,209.32
  4. Step 4: Simplify right side
    1,396.40x = 2,323,539.08
  5. Step 5: Solve for x
    x = 2,323,539.08/1,396.40
  6. Step 6: Final answer
    x = 1,663.95

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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.