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Finding the Fourth Proportional to 153,568.64, 211,964.32 and 99,987.52

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Solution

The fourth proportional to 153,568.64, 211,964.32 and 99,987.52 is: 138,008.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    153,568.64 : 211,964.32 = 99,987.52 : x
  2. Step 2: Convert to fraction form
    153,568.64/211,964.32 = 99,987.52/x
  3. Step 3: Cross multiply
    153,568.64x = 211,964.32 × 99,987.52
  4. Step 4: Simplify right side
    153,568.64x = 21,193,786,685.29
  5. Step 5: Solve for x
    x = 21,193,786,685.29/153,568.64
  6. Step 6: Final answer
    x = 138,008.56

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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.