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Finding the Fourth Proportional to 21,821.88, 30,114.39 and 12,390.64

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Solution

The fourth proportional to 21,821.88, 30,114.39 and 12,390.64 is: 17,099.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,821.88 : 30,114.39 = 12,390.64 : x
  2. Step 2: Convert to fraction form
    21,821.88/30,114.39 = 12,390.64/x
  3. Step 3: Cross multiply
    21,821.88x = 30,114.39 × 12,390.64
  4. Step 4: Simplify right side
    21,821.88x = 373,136,565.31
  5. Step 5: Solve for x
    x = 373,136,565.31/21,821.88
  6. Step 6: Final answer
    x = 17,099.19

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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.