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Finding the Fourth Proportional to 18,705.76, 25,812.48 and 11,151.52

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Solution

The fourth proportional to 18,705.76, 25,812.48 and 11,151.52 is: 15,388.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,705.76 : 25,812.48 = 11,151.52 : x
  2. Step 2: Convert to fraction form
    18,705.76/25,812.48 = 11,151.52/x
  3. Step 3: Cross multiply
    18,705.76x = 25,812.48 × 11,151.52
  4. Step 4: Simplify right side
    18,705.76x = 287,848,386.97
  5. Step 5: Solve for x
    x = 287,848,386.97/18,705.76
  6. Step 6: Final answer
    x = 15,388.22

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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.