Home / 138,413.68-191,010.04-78,003.72

Finding the Fourth Proportional to 138,413.68, 191,010.04 and 78,003.72

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Solution

The fourth proportional to 138,413.68, 191,010.04 and 78,003.72 is: 107,644.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,413.68 : 191,010.04 = 78,003.72 : x
  2. Step 2: Convert to fraction form
    138,413.68/191,010.04 = 78,003.72/x
  3. Step 3: Cross multiply
    138,413.68x = 191,010.04 × 78,003.72
  4. Step 4: Simplify right side
    138,413.68x = 14,899,493,677.35
  5. Step 5: Solve for x
    x = 14,899,493,677.35/138,413.68
  6. Step 6: Final answer
    x = 107,644.66

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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.