Home / 100,413.76-138,569.85-57,971.38

Finding the Fourth Proportional to 100,413.76, 138,569.85 and 57,971.38

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Solution

The fourth proportional to 100,413.76, 138,569.85 and 57,971.38 is: 79,999.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,413.76 : 138,569.85 = 57,971.38 : x
  2. Step 2: Convert to fraction form
    100,413.76/138,569.85 = 57,971.38/x
  3. Step 3: Cross multiply
    100,413.76x = 138,569.85 × 57,971.38
  4. Step 4: Simplify right side
    100,413.76x = 8,033,085,430.89
  5. Step 5: Solve for x
    x = 8,033,085,430.89/100,413.76
  6. Step 6: Final answer
    x = 79,999.85

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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.