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Finding the Fourth Proportional to 18,608.64, 25,689.60 and 15,809.28

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Solution

The fourth proportional to 18,608.64, 25,689.60 and 15,809.28 is: 21,825.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,608.64 : 25,689.60 = 15,809.28 : x
  2. Step 2: Convert to fraction form
    18,608.64/25,689.60 = 15,809.28/x
  3. Step 3: Cross multiply
    18,608.64x = 25,689.60 × 15,809.28
  4. Step 4: Simplify right side
    18,608.64x = 406,134,079.49
  5. Step 5: Solve for x
    x = 406,134,079.49/18,608.64
  6. Step 6: Final answer
    x = 21,825.03

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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.