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Finding the Fourth Proportional to 28,419.60, 42,621.30 and 8,693.40

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Solution

The fourth proportional to 28,419.60, 42,621.30 and 8,693.40 is: 13,037.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,419.60 : 42,621.30 = 8,693.40 : x
  2. Step 2: Convert to fraction form
    28,419.60/42,621.30 = 8,693.40/x
  3. Step 3: Cross multiply
    28,419.60x = 42,621.30 × 8,693.40
  4. Step 4: Simplify right side
    28,419.60x = 370,524,009.42
  5. Step 5: Solve for x
    x = 370,524,009.42/28,419.60
  6. Step 6: Final answer
    x = 13,037.62

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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.