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Finding the Fourth Proportional to 15,129.19, 20,880.21 and 9,161.11

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Solution

The fourth proportional to 15,129.19, 20,880.21 and 9,161.11 is: 12,643.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,129.19 : 20,880.21 = 9,161.11 : x
  2. Step 2: Convert to fraction form
    15,129.19/20,880.21 = 9,161.11/x
  3. Step 3: Cross multiply
    15,129.19x = 20,880.21 × 9,161.11
  4. Step 4: Simplify right side
    15,129.19x = 191,285,900.63
  5. Step 5: Solve for x
    x = 191,285,900.63/15,129.19
  6. Step 6: Final answer
    x = 12,643.50

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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.