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Finding the Fourth Proportional to 138,599.28, 191,198.28 and 86,907.24

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Solution

The fourth proportional to 138,599.28, 191,198.28 and 86,907.24 is: 119,888.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,599.28 : 191,198.28 = 86,907.24 : x
  2. Step 2: Convert to fraction form
    138,599.28/191,198.28 = 86,907.24/x
  3. Step 3: Cross multiply
    138,599.28x = 191,198.28 × 86,907.24
  4. Step 4: Simplify right side
    138,599.28x = 16,616,514,807.55
  5. Step 5: Solve for x
    x = 16,616,514,807.55/138,599.28
  6. Step 6: Final answer
    x = 119,888.90

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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.