Home / 12,824.80-19,237.20-7,878.40

Finding the Fourth Proportional to 12,824.80, 19,237.20 and 7,878.40

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Solution

The fourth proportional to 12,824.80, 19,237.20 and 7,878.40 is: 11,817.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,824.80 : 19,237.20 = 7,878.40 : x
  2. Step 2: Convert to fraction form
    12,824.80/19,237.20 = 7,878.40/x
  3. Step 3: Cross multiply
    12,824.80x = 19,237.20 × 7,878.40
  4. Step 4: Simplify right side
    12,824.80x = 151,558,356.48
  5. Step 5: Solve for x
    x = 151,558,356.48/12,824.80
  6. Step 6: Final answer
    x = 11,817.60

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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.