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Finding the Fourth Proportional to 18,712.64, 25,822.80 and 11,155.08

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Solution

The fourth proportional to 18,712.64, 25,822.80 and 11,155.08 is: 15,393.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,712.64 : 25,822.80 = 11,155.08 : x
  2. Step 2: Convert to fraction form
    18,712.64/25,822.80 = 11,155.08/x
  3. Step 3: Cross multiply
    18,712.64x = 25,822.80 × 11,155.08
  4. Step 4: Simplify right side
    18,712.64x = 288,055,344.82
  5. Step 5: Solve for x
    x = 288,055,344.82/18,712.64
  6. Step 6: Final answer
    x = 15,393.62

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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.