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Finding the Fourth Proportional to 86,151.47, 128,902.59 and 77,410.76

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Solution

The fourth proportional to 86,151.47, 128,902.59 and 77,410.76 is: 115,824.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,151.47 : 128,902.59 = 77,410.76 : x
  2. Step 2: Convert to fraction form
    86,151.47/128,902.59 = 77,410.76/x
  3. Step 3: Cross multiply
    86,151.47x = 128,902.59 × 77,410.76
  4. Step 4: Simplify right side
    86,151.47x = 9,978,446,813.36
  5. Step 5: Solve for x
    x = 9,978,446,813.36/86,151.47
  6. Step 6: Final answer
    x = 115,824.46

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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.