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Finding the Fourth Proportional to 15,782.71, 21,780.03 and 8,612.62

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Solution

The fourth proportional to 15,782.71, 21,780.03 and 8,612.62 is: 11,885.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,782.71 : 21,780.03 = 8,612.62 : x
  2. Step 2: Convert to fraction form
    15,782.71/21,780.03 = 8,612.62/x
  3. Step 3: Cross multiply
    15,782.71x = 21,780.03 × 8,612.62
  4. Step 4: Simplify right side
    15,782.71x = 187,583,121.98
  5. Step 5: Solve for x
    x = 187,583,121.98/15,782.71
  6. Step 6: Final answer
    x = 11,885.36

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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.