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Finding the Fourth Proportional to 21,874.53, 30,188.25 and 12,919.62

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Solution

The fourth proportional to 21,874.53, 30,188.25 and 12,919.62 is: 17,829.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,874.53 : 30,188.25 = 12,919.62 : x
  2. Step 2: Convert to fraction form
    21,874.53/30,188.25 = 12,919.62/x
  3. Step 3: Cross multiply
    21,874.53x = 30,188.25 × 12,919.62
  4. Step 4: Simplify right side
    21,874.53x = 390,020,718.47
  5. Step 5: Solve for x
    x = 390,020,718.47/21,874.53
  6. Step 6: Final answer
    x = 17,829.90

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.