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Finding the Fourth Proportional to 28,253.84, 38,989.20 and 15,679.40

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Solution

The fourth proportional to 28,253.84, 38,989.20 and 15,679.40 is: 21,636.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,253.84 : 38,989.20 = 15,679.40 : x
  2. Step 2: Convert to fraction form
    28,253.84/38,989.20 = 15,679.40/x
  3. Step 3: Cross multiply
    28,253.84x = 38,989.20 × 15,679.40
  4. Step 4: Simplify right side
    28,253.84x = 611,327,262.48
  5. Step 5: Solve for x
    x = 611,327,262.48/28,253.84
  6. Step 6: Final answer
    x = 21,636.96

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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.