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Finding the Fourth Proportional to 28,488.54, 42,748.11 and 11,860.05

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Solution

The fourth proportional to 28,488.54, 42,748.11 and 11,860.05 is: 17,796.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,488.54 : 42,748.11 = 11,860.05 : x
  2. Step 2: Convert to fraction form
    28,488.54/42,748.11 = 11,860.05/x
  3. Step 3: Cross multiply
    28,488.54x = 42,748.11 × 11,860.05
  4. Step 4: Simplify right side
    28,488.54x = 506,994,722.01
  5. Step 5: Solve for x
    x = 506,994,722.01/28,488.54
  6. Step 6: Final answer
    x = 17,796.44

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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.