Home / 15,387.21-21,222.27-11,138.90

Finding the Fourth Proportional to 15,387.21, 21,222.27 and 11,138.90

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Solution

The fourth proportional to 15,387.21, 21,222.27 and 11,138.90 is: 15,362.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,387.21 : 21,222.27 = 11,138.90 : x
  2. Step 2: Convert to fraction form
    15,387.21/21,222.27 = 11,138.90/x
  3. Step 3: Cross multiply
    15,387.21x = 21,222.27 × 11,138.90
  4. Step 4: Simplify right side
    15,387.21x = 236,392,637.19
  5. Step 5: Solve for x
    x = 236,392,637.19/15,387.21
  6. Step 6: Final answer
    x = 15,362.93

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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.