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Finding the Fourth Proportional to 15,145.75, 20,899.63 and 8,774.39

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Solution

The fourth proportional to 15,145.75, 20,899.63 and 8,774.39 is: 12,107.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,145.75 : 20,899.63 = 8,774.39 : x
  2. Step 2: Convert to fraction form
    15,145.75/20,899.63 = 8,774.39/x
  3. Step 3: Cross multiply
    15,145.75x = 20,899.63 × 8,774.39
  4. Step 4: Simplify right side
    15,145.75x = 183,381,534.79
  5. Step 5: Solve for x
    x = 183,381,534.79/15,145.75
  6. Step 6: Final answer
    x = 12,107.79

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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.