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Finding the Fourth Proportional to 86,100.90, 128,689.70 and 77,648.14

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Solution

The fourth proportional to 86,100.90, 128,689.70 and 77,648.14 is: 116,055.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,100.90 : 128,689.70 = 77,648.14 : x
  2. Step 2: Convert to fraction form
    86,100.90/128,689.70 = 77,648.14/x
  3. Step 3: Cross multiply
    86,100.90x = 128,689.70 × 77,648.14
  4. Step 4: Simplify right side
    86,100.90x = 9,992,515,842.16
  5. Step 5: Solve for x
    x = 9,992,515,842.16/86,100.90
  6. Step 6: Final answer
    x = 116,055.88

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.