Home / 15,849.99-21,870.27-9,135.90

Finding the Fourth Proportional to 15,849.99, 21,870.27 and 9,135.90

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Solution

The fourth proportional to 15,849.99, 21,870.27 and 9,135.90 is: 12,605.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,849.99 : 21,870.27 = 9,135.90 : x
  2. Step 2: Convert to fraction form
    15,849.99/21,870.27 = 9,135.90/x
  3. Step 3: Cross multiply
    15,849.99x = 21,870.27 × 9,135.90
  4. Step 4: Simplify right side
    15,849.99x = 199,804,599.69
  5. Step 5: Solve for x
    x = 199,804,599.69/15,849.99
  6. Step 6: Final answer
    x = 12,605.98

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.