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Finding the Fourth Proportional to 21,703.78, 29,951.10 and 12,143.67

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Solution

The fourth proportional to 21,703.78, 29,951.10 and 12,143.67 is: 16,758.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,703.78 : 29,951.10 = 12,143.67 : x
  2. Step 2: Convert to fraction form
    21,703.78/29,951.10 = 12,143.67/x
  3. Step 3: Cross multiply
    21,703.78x = 29,951.10 × 12,143.67
  4. Step 4: Simplify right side
    21,703.78x = 363,716,274.54
  5. Step 5: Solve for x
    x = 363,716,274.54/21,703.78
  6. Step 6: Final answer
    x = 16,758.20

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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.