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Finding the Fourth Proportional to 15,771.34, 21,764.43 and 8,697.79

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Solution

The fourth proportional to 15,771.34, 21,764.43 and 8,697.79 is: 12,002.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,771.34 : 21,764.43 = 8,697.79 : x
  2. Step 2: Convert to fraction form
    15,771.34/21,764.43 = 8,697.79/x
  3. Step 3: Cross multiply
    15,771.34x = 21,764.43 × 8,697.79
  4. Step 4: Simplify right side
    15,771.34x = 189,302,441.61
  5. Step 5: Solve for x
    x = 189,302,441.61/15,771.34
  6. Step 6: Final answer
    x = 12,002.94

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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.