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Finding the Fourth Proportional to 15,847.45, 21,869.80 and 8,774.12

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Solution

The fourth proportional to 15,847.45, 21,869.80 and 8,774.12 is: 12,108.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,847.45 : 21,869.80 = 8,774.12 : x
  2. Step 2: Convert to fraction form
    15,847.45/21,869.80 = 8,774.12/x
  3. Step 3: Cross multiply
    15,847.45x = 21,869.80 × 8,774.12
  4. Step 4: Simplify right side
    15,847.45x = 191,888,282.32
  5. Step 5: Solve for x
    x = 191,888,282.32/15,847.45
  6. Step 6: Final answer
    x = 12,108.47

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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.