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Finding the Fourth Proportional to 18,928.78, 28,356.78 and 10,583.49

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Solution

The fourth proportional to 18,928.78, 28,356.78 and 10,583.49 is: 15,854.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,928.78 : 28,356.78 = 10,583.49 : x
  2. Step 2: Convert to fraction form
    18,928.78/28,356.78 = 10,583.49/x
  3. Step 3: Cross multiply
    18,928.78x = 28,356.78 × 10,583.49
  4. Step 4: Simplify right side
    18,928.78x = 300,113,697.56
  5. Step 5: Solve for x
    x = 300,113,697.56/18,928.78
  6. Step 6: Final answer
    x = 15,854.89

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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.