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Finding the Fourth Proportional to 21,002.40, 31,503.60 and 15,213.60

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Solution

The fourth proportional to 21,002.40, 31,503.60 and 15,213.60 is: 22,820.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,002.40 : 31,503.60 = 15,213.60 : x
  2. Step 2: Convert to fraction form
    21,002.40/31,503.60 = 15,213.60/x
  3. Step 3: Cross multiply
    21,002.40x = 31,503.60 × 15,213.60
  4. Step 4: Simplify right side
    21,002.40x = 479,283,168.96
  5. Step 5: Solve for x
    x = 479,283,168.96/21,002.40
  6. Step 6: Final answer
    x = 22,820.40

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1.5x scale

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.