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Finding the Fourth Proportional to 99,211.52, 136,947.84 and 65,688.32

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Solution

The fourth proportional to 99,211.52, 136,947.84 and 65,688.32 is: 90,673.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    99,211.52 : 136,947.84 = 65,688.32 : x
  2. Step 2: Convert to fraction form
    99,211.52/136,947.84 = 65,688.32/x
  3. Step 3: Cross multiply
    99,211.52x = 136,947.84 × 65,688.32
  4. Step 4: Simplify right side
    99,211.52x = 8,995,873,537.23
  5. Step 5: Solve for x
    x = 8,995,873,537.23/99,211.52
  6. Step 6: Final answer
    x = 90,673.68

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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.