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Finding the Fourth Proportional to 18,938.79, 28,408.17 and 5,087.79

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Solution

The fourth proportional to 18,938.79, 28,408.17 and 5,087.79 is: 7,631.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,938.79 : 28,408.17 = 5,087.79 : x
  2. Step 2: Convert to fraction form
    18,938.79/28,408.17 = 5,087.79/x
  3. Step 3: Cross multiply
    18,938.79x = 28,408.17 × 5,087.79
  4. Step 4: Simplify right side
    18,938.79x = 144,534,803.24
  5. Step 5: Solve for x
    x = 144,534,803.24/18,938.79
  6. Step 6: Final answer
    x = 7,631.68

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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.