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Finding the Fourth Proportional to 138,413.88, 191,011.14 and 74,751.68

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Solution

The fourth proportional to 138,413.88, 191,011.14 and 74,751.68 is: 103,157.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,413.88 : 191,011.14 = 74,751.68 : x
  2. Step 2: Convert to fraction form
    138,413.88/191,011.14 = 74,751.68/x
  3. Step 3: Cross multiply
    138,413.88x = 191,011.14 × 74,751.68
  4. Step 4: Simplify right side
    138,413.88x = 14,278,403,613.72
  5. Step 5: Solve for x
    x = 14,278,403,613.72/138,413.88
  6. Step 6: Final answer
    x = 103,157.31

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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.