Home / 12,815.18-19,217.00-5,415.83

Finding the Fourth Proportional to 12,815.18, 19,217.00 and 5,415.83

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Solution

The fourth proportional to 12,815.18, 19,217.00 and 5,415.83 is: 8,121.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,815.18 : 19,217.00 = 5,415.83 : x
  2. Step 2: Convert to fraction form
    12,815.18/19,217.00 = 5,415.83/x
  3. Step 3: Cross multiply
    12,815.18x = 19,217.00 × 5,415.83
  4. Step 4: Simplify right side
    12,815.18x = 104,075,881.95
  5. Step 5: Solve for x
    x = 104,075,881.95/12,815.18
  6. Step 6: Final answer
    x = 8,121.30

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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.