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Finding the Fourth Proportional to 15,570, 21,486.60 and 9,981

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Solution

The fourth proportional to 15,570, 21,486.60 and 9,981 is: 13,773.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,570 : 21,486.60 = 9,981 : x
  2. Step 2: Convert to fraction form
    15,570/21,486.60 = 9,981/x
  3. Step 3: Cross multiply
    15,570x = 21,486.60 × 9,981
  4. Step 4: Simplify right side
    15,570x = 214,457,754.60
  5. Step 5: Solve for x
    x = 214,457,754.60/15,570
  6. Step 6: Final answer
    x = 13,773.78

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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.