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Finding the Fourth Proportional to 18,900.78, 28,341.72 and 11,005.92

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Solution

The fourth proportional to 18,900.78, 28,341.72 and 11,005.92 is: 16,503.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,900.78 : 28,341.72 = 11,005.92 : x
  2. Step 2: Convert to fraction form
    18,900.78/28,341.72 = 11,005.92/x
  3. Step 3: Cross multiply
    18,900.78x = 28,341.72 × 11,005.92
  4. Step 4: Simplify right side
    18,900.78x = 311,926,702.98
  5. Step 5: Solve for x
    x = 311,926,702.98/18,900.78
  6. Step 6: Final answer
    x = 16,503.38

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.