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Finding the Fourth Proportional to 19,101.65, 28,670.70 and 11,720.52

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Solution

The fourth proportional to 19,101.65, 28,670.70 and 11,720.52 is: 17,591.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,101.65 : 28,670.70 = 11,720.52 : x
  2. Step 2: Convert to fraction form
    19,101.65/28,670.70 = 11,720.52/x
  3. Step 3: Cross multiply
    19,101.65x = 28,670.70 × 11,720.52
  4. Step 4: Simplify right side
    19,101.65x = 336,035,512.76
  5. Step 5: Solve for x
    x = 336,035,512.76/19,101.65
  6. Step 6: Final answer
    x = 17,591.97

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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.