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Finding the Fourth Proportional to 100,297.08, 138,413.34 and 54,979.20

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Solution

The fourth proportional to 100,297.08, 138,413.34 and 54,979.20 is: 75,873.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,297.08 : 138,413.34 = 54,979.20 : x
  2. Step 2: Convert to fraction form
    100,297.08/138,413.34 = 54,979.20/x
  3. Step 3: Cross multiply
    100,297.08x = 138,413.34 × 54,979.20
  4. Step 4: Simplify right side
    100,297.08x = 7,609,854,702.53
  5. Step 5: Solve for x
    x = 7,609,854,702.53/100,297.08
  6. Step 6: Final answer
    x = 75,873.14

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.