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Finding the Fourth Proportional to 20,487.84, 28,218 and 17,688.48

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Solution

The fourth proportional to 20,487.84, 28,218 and 17,688.48 is: 24,362.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,487.84 : 28,218 = 17,688.48 : x
  2. Step 2: Convert to fraction form
    20,487.84/28,218 = 17,688.48/x
  3. Step 3: Cross multiply
    20,487.84x = 28,218 × 17,688.48
  4. Step 4: Simplify right side
    20,487.84x = 499,133,528.64
  5. Step 5: Solve for x
    x = 499,133,528.64/20,487.84
  6. Step 6: Final answer
    x = 24,362.43

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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.