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Finding the Fourth Proportional to 21,993.55, 30,310.40 and 15,620.42

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Solution

The fourth proportional to 21,993.55, 30,310.40 and 15,620.42 is: 21,527.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,993.55 : 30,310.40 = 15,620.42 : x
  2. Step 2: Convert to fraction form
    21,993.55/30,310.40 = 15,620.42/x
  3. Step 3: Cross multiply
    21,993.55x = 30,310.40 × 15,620.42
  4. Step 4: Simplify right side
    21,993.55x = 473,461,254.14
  5. Step 5: Solve for x
    x = 473,461,254.14/21,993.55
  6. Step 6: Final answer
    x = 21,527.28

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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.