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Finding the Fourth Proportional to 21,479.61, 32,211.66 and 7,435.80

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Solution

The fourth proportional to 21,479.61, 32,211.66 and 7,435.80 is: 11,151.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,479.61 : 32,211.66 = 7,435.80 : x
  2. Step 2: Convert to fraction form
    21,479.61/32,211.66 = 7,435.80/x
  3. Step 3: Cross multiply
    21,479.61x = 32,211.66 × 7,435.80
  4. Step 4: Simplify right side
    21,479.61x = 239,519,478.86
  5. Step 5: Solve for x
    x = 239,519,478.86/21,479.61
  6. Step 6: Final answer
    x = 11,151.02

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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.