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Finding the Fourth Proportional to 13,598.79, 20,381.78 and 7,021.40

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Solution

The fourth proportional to 13,598.79, 20,381.78 and 7,021.40 is: 10,523.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,598.79 : 20,381.78 = 7,021.40 : x
  2. Step 2: Convert to fraction form
    13,598.79/20,381.78 = 7,021.40/x
  3. Step 3: Cross multiply
    13,598.79x = 20,381.78 × 7,021.40
  4. Step 4: Simplify right side
    13,598.79x = 143,108,493.08
  5. Step 5: Solve for x
    x = 143,108,493.08/13,598.79
  6. Step 6: Final answer
    x = 10,523.62

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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.