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Finding the Fourth Proportional to 28,648.31, 42,972.45 and 8,928.45

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Solution

The fourth proportional to 28,648.31, 42,972.45 and 8,928.45 is: 13,392.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,648.31 : 42,972.45 = 8,928.45 : x
  2. Step 2: Convert to fraction form
    28,648.31/42,972.45 = 8,928.45/x
  3. Step 3: Cross multiply
    28,648.31x = 42,972.45 × 8,928.45
  4. Step 4: Simplify right side
    28,648.31x = 383,677,371.20
  5. Step 5: Solve for x
    x = 383,677,371.20/28,648.31
  6. Step 6: Final answer
    x = 13,392.67

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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.