Home / 12,815.78-19,228.80-6,240.20

Finding the Fourth Proportional to 12,815.78, 19,228.80 and 6,240.20

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Solution

The fourth proportional to 12,815.78, 19,228.80 and 6,240.20 is: 9,362.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,815.78 : 19,228.80 = 6,240.20 : x
  2. Step 2: Convert to fraction form
    12,815.78/19,228.80 = 6,240.20/x
  3. Step 3: Cross multiply
    12,815.78x = 19,228.80 × 6,240.20
  4. Step 4: Simplify right side
    12,815.78x = 119,991,557.76
  5. Step 5: Solve for x
    x = 119,991,557.76/12,815.78
  6. Step 6: Final answer
    x = 9,362.80

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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.