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Finding the Fourth Proportional to 15,558, 21,477.70 and 10,781.56

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Solution

The fourth proportional to 15,558, 21,477.70 and 10,781.56 is: 14,883.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,558 : 21,477.70 = 10,781.56 : x
  2. Step 2: Convert to fraction form
    15,558/21,477.70 = 10,781.56/x
  3. Step 3: Cross multiply
    15,558x = 21,477.70 × 10,781.56
  4. Step 4: Simplify right side
    15,558x = 231,563,111.21
  5. Step 5: Solve for x
    x = 231,563,111.21/15,558
  6. Step 6: Final answer
    x = 14,883.86

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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.