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Finding the Fourth Proportional to 28,415.60, 42,621.86 and 8,694.16

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Solution

The fourth proportional to 28,415.60, 42,621.86 and 8,694.16 is: 13,040.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,415.60 : 42,621.86 = 8,694.16 : x
  2. Step 2: Convert to fraction form
    28,415.60/42,621.86 = 8,694.16/x
  3. Step 3: Cross multiply
    28,415.60x = 42,621.86 × 8,694.16
  4. Step 4: Simplify right side
    28,415.60x = 370,561,270.34
  5. Step 5: Solve for x
    x = 370,561,270.34/28,415.60
  6. Step 6: Final answer
    x = 13,040.77

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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.