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Finding the Fourth Proportional to 15,221.95, 21,006.21 and 8,507.57

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Solution

The fourth proportional to 15,221.95, 21,006.21 and 8,507.57 is: 11,740.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,221.95 : 21,006.21 = 8,507.57 : x
  2. Step 2: Convert to fraction form
    15,221.95/21,006.21 = 8,507.57/x
  3. Step 3: Cross multiply
    15,221.95x = 21,006.21 × 8,507.57
  4. Step 4: Simplify right side
    15,221.95x = 178,711,802.01
  5. Step 5: Solve for x
    x = 178,711,802.01/15,221.95
  6. Step 6: Final answer
    x = 11,740.40

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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.