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Finding the Fourth Proportional to 12,648.60, 18,972.90 and 11,698.20

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Solution

The fourth proportional to 12,648.60, 18,972.90 and 11,698.20 is: 17,547.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,648.60 : 18,972.90 = 11,698.20 : x
  2. Step 2: Convert to fraction form
    12,648.60/18,972.90 = 11,698.20/x
  3. Step 3: Cross multiply
    12,648.60x = 18,972.90 × 11,698.20
  4. Step 4: Simplify right side
    12,648.60x = 221,948,778.78
  5. Step 5: Solve for x
    x = 221,948,778.78/12,648.60
  6. Step 6: Final answer
    x = 17,547.30

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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.