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Finding the Fourth Proportional to 98,900.40, 136,403.12 and 86,938.32

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Solution

The fourth proportional to 98,900.40, 136,403.12 and 86,938.32 is: 119,905.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    98,900.40 : 136,403.12 = 86,938.32 : x
  2. Step 2: Convert to fraction form
    98,900.40/136,403.12 = 86,938.32/x
  3. Step 3: Cross multiply
    98,900.40x = 136,403.12 × 86,938.32
  4. Step 4: Simplify right side
    98,900.40x = 11,858,658,095.56
  5. Step 5: Solve for x
    x = 11,858,658,095.56/98,900.40
  6. Step 6: Final answer
    x = 119,905.06

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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.