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Finding the Fourth Proportional to 12,698.40, 19,031.40 and 11,305.20

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Solution

The fourth proportional to 12,698.40, 19,031.40 and 11,305.20 is: 16,943.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,698.40 : 19,031.40 = 11,305.20 : x
  2. Step 2: Convert to fraction form
    12,698.40/19,031.40 = 11,305.20/x
  3. Step 3: Cross multiply
    12,698.40x = 19,031.40 × 11,305.20
  4. Step 4: Simplify right side
    12,698.40x = 215,153,783.28
  5. Step 5: Solve for x
    x = 215,153,783.28/12,698.40
  6. Step 6: Final answer
    x = 16,943.38

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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.