Home / 1,538.60-2,120.10-1,188.20

Finding the Fourth Proportional to 1,538.60, 2,120.10 and 1,188.20

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Solution

The fourth proportional to 1,538.60, 2,120.10 and 1,188.20 is: 1,637.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,538.60 : 2,120.10 = 1,188.20 : x
  2. Step 2: Convert to fraction form
    1,538.60/2,120.10 = 1,188.20/x
  3. Step 3: Cross multiply
    1,538.60x = 2,120.10 × 1,188.20
  4. Step 4: Simplify right side
    1,538.60x = 2,519,102.82
  5. Step 5: Solve for x
    x = 2,519,102.82/1,538.60
  6. Step 6: Final answer
    x = 1,637.27

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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.