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Finding the Fourth Proportional to 28,420.76, 42,608 and 10,641.44

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Solution

The fourth proportional to 28,420.76, 42,608 and 10,641.44 is: 15,953.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,420.76 : 42,608 = 10,641.44 : x
  2. Step 2: Convert to fraction form
    28,420.76/42,608 = 10,641.44/x
  3. Step 3: Cross multiply
    28,420.76x = 42,608 × 10,641.44
  4. Step 4: Simplify right side
    28,420.76x = 453,410,475.52
  5. Step 5: Solve for x
    x = 453,410,475.52/28,420.76
  6. Step 6: Final answer
    x = 15,953.50

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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.