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Finding the Fourth Proportional to 128,413.68, 192,659.31 and 38,459.31

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Solution

The fourth proportional to 128,413.68, 192,659.31 and 38,459.31 is: 57,700.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,413.68 : 192,659.31 = 38,459.31 : x
  2. Step 2: Convert to fraction form
    128,413.68/192,659.31 = 38,459.31/x
  3. Step 3: Cross multiply
    128,413.68x = 192,659.31 × 38,459.31
  4. Step 4: Simplify right side
    128,413.68x = 7,409,544,127.68
  5. Step 5: Solve for x
    x = 7,409,544,127.68/128,413.68
  6. Step 6: Final answer
    x = 57,700.58

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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.