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Finding the Fourth Proportional to 28,662.72, 42,990 and 11,801.76

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Solution

The fourth proportional to 28,662.72, 42,990 and 11,801.76 is: 17,700.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,662.72 : 42,990 = 11,801.76 : x
  2. Step 2: Convert to fraction form
    28,662.72/42,990 = 11,801.76/x
  3. Step 3: Cross multiply
    28,662.72x = 42,990 × 11,801.76
  4. Step 4: Simplify right side
    28,662.72x = 507,357,662.40
  5. Step 5: Solve for x
    x = 507,357,662.40/28,662.72
  6. Step 6: Final answer
    x = 17,700.96

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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.