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Finding the Fourth Proportional to 15,782.99, 21,780.99 and 9,069.92

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Solution

The fourth proportional to 15,782.99, 21,780.99 and 9,069.92 is: 12,516.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,782.99 : 21,780.99 = 9,069.92 : x
  2. Step 2: Convert to fraction form
    15,782.99/21,780.99 = 9,069.92/x
  3. Step 3: Cross multiply
    15,782.99x = 21,780.99 × 9,069.92
  4. Step 4: Simplify right side
    15,782.99x = 197,551,836.82
  5. Step 5: Solve for x
    x = 197,551,836.82/15,782.99
  6. Step 6: Final answer
    x = 12,516.76

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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.