Home / 13,139.40-19,709.10-12,880.20

Finding the Fourth Proportional to 13,139.40, 19,709.10 and 12,880.20

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Solution

The fourth proportional to 13,139.40, 19,709.10 and 12,880.20 is: 19,320.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,139.40 : 19,709.10 = 12,880.20 : x
  2. Step 2: Convert to fraction form
    13,139.40/19,709.10 = 12,880.20/x
  3. Step 3: Cross multiply
    13,139.40x = 19,709.10 × 12,880.20
  4. Step 4: Simplify right side
    13,139.40x = 253,857,149.82
  5. Step 5: Solve for x
    x = 253,857,149.82/13,139.40
  6. Step 6: Final answer
    x = 19,320.30

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.