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Finding the Fourth Proportional to 92,405.20, 138,607.80 and 57,413.20

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Solution

The fourth proportional to 92,405.20, 138,607.80 and 57,413.20 is: 86,119.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    92,405.20 : 138,607.80 = 57,413.20 : x
  2. Step 2: Convert to fraction form
    92,405.20/138,607.80 = 57,413.20/x
  3. Step 3: Cross multiply
    92,405.20x = 138,607.80 × 57,413.20
  4. Step 4: Simplify right side
    92,405.20x = 7,957,917,342.96
  5. Step 5: Solve for x
    x = 7,957,917,342.96/92,405.20
  6. Step 6: Final answer
    x = 86,119.80

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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.