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Finding the Fourth Proportional to 28,143.70, 38,838.09 and 16,818.10

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Solution

The fourth proportional to 28,143.70, 38,838.09 and 16,818.10 is: 23,208.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,143.70 : 38,838.09 = 16,818.10 : x
  2. Step 2: Convert to fraction form
    28,143.70/38,838.09 = 16,818.10/x
  3. Step 3: Cross multiply
    28,143.70x = 38,838.09 × 16,818.10
  4. Step 4: Simplify right side
    28,143.70x = 653,182,881.43
  5. Step 5: Solve for x
    x = 653,182,881.43/28,143.70
  6. Step 6: Final answer
    x = 23,208.85

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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.