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Finding the Fourth Proportional to 86,101.80, 128,788.20 and 77,280.90

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Solution

The fourth proportional to 86,101.80, 128,788.20 and 77,280.90 is: 115,594.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,101.80 : 128,788.20 = 77,280.90 : x
  2. Step 2: Convert to fraction form
    86,101.80/128,788.20 = 77,280.90/x
  3. Step 3: Cross multiply
    86,101.80x = 128,788.20 × 77,280.90
  4. Step 4: Simplify right side
    86,101.80x = 9,952,868,005.38
  5. Step 5: Solve for x
    x = 9,952,868,005.38/86,101.80
  6. Step 6: Final answer
    x = 115,594.19

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.