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Finding the Fourth Proportional to 21,480.47, 32,211.19 and 11,482.79

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Solution

The fourth proportional to 21,480.47, 32,211.19 and 11,482.79 is: 17,219.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,480.47 : 32,211.19 = 11,482.79 : x
  2. Step 2: Convert to fraction form
    21,480.47/32,211.19 = 11,482.79/x
  3. Step 3: Cross multiply
    21,480.47x = 32,211.19 × 11,482.79
  4. Step 4: Simplify right side
    21,480.47x = 369,874,451.21
  5. Step 5: Solve for x
    x = 369,874,451.21/21,480.47
  6. Step 6: Final answer
    x = 17,219.10

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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.