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Finding the Fourth Proportional to 15,419.68, 21,277.56 and 8,705.68

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Solution

The fourth proportional to 15,419.68, 21,277.56 and 8,705.68 is: 12,012.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,419.68 : 21,277.56 = 8,705.68 : x
  2. Step 2: Convert to fraction form
    15,419.68/21,277.56 = 8,705.68/x
  3. Step 3: Cross multiply
    15,419.68x = 21,277.56 × 8,705.68
  4. Step 4: Simplify right side
    15,419.68x = 185,235,628.54
  5. Step 5: Solve for x
    x = 185,235,628.54/15,419.68
  6. Step 6: Final answer
    x = 12,012.94

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.