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Finding the Fourth Proportional to 86,154.46, 128,907.08 and 77,413.76

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Solution

The fourth proportional to 86,154.46, 128,907.08 and 77,413.76 is: 115,828.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,154.46 : 128,907.08 = 77,413.76 : x
  2. Step 2: Convert to fraction form
    86,154.46/128,907.08 = 77,413.76/x
  3. Step 3: Cross multiply
    86,154.46x = 128,907.08 × 77,413.76
  4. Step 4: Simplify right side
    86,154.46x = 9,979,181,753.42
  5. Step 5: Solve for x
    x = 9,979,181,753.42/86,154.46
  6. Step 6: Final answer
    x = 115,828.96

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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.