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Finding the Fourth Proportional to 18,715.86, 25,832.12 and 12,749.91

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Solution

The fourth proportional to 18,715.86, 25,832.12 and 12,749.91 is: 17,597.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,715.86 : 25,832.12 = 12,749.91 : x
  2. Step 2: Convert to fraction form
    18,715.86/25,832.12 = 12,749.91/x
  3. Step 3: Cross multiply
    18,715.86x = 25,832.12 × 12,749.91
  4. Step 4: Simplify right side
    18,715.86x = 329,357,044.49
  5. Step 5: Solve for x
    x = 329,357,044.49/18,715.86
  6. Step 6: Final answer
    x = 17,597.75

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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.