Home / 12,972.40-19,420.20-7,788.40

Finding the Fourth Proportional to 12,972.40, 19,420.20 and 7,788.40

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Solution

The fourth proportional to 12,972.40, 19,420.20 and 7,788.40 is: 11,659.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,972.40 : 19,420.20 = 7,788.40 : x
  2. Step 2: Convert to fraction form
    12,972.40/19,420.20 = 7,788.40/x
  3. Step 3: Cross multiply
    12,972.40x = 19,420.20 × 7,788.40
  4. Step 4: Simplify right side
    12,972.40x = 151,252,285.68
  5. Step 5: Solve for x
    x = 151,252,285.68/12,972.40
  6. Step 6: Final answer
    x = 11,659.55

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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.