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Finding the Fourth Proportional to 125,413.30, 187,828.35 and 85,755.70

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Solution

The fourth proportional to 125,413.30, 187,828.35 and 85,755.70 is: 128,434.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    125,413.30 : 187,828.35 = 85,755.70 : x
  2. Step 2: Convert to fraction form
    125,413.30/187,828.35 = 85,755.70/x
  3. Step 3: Cross multiply
    125,413.30x = 187,828.35 × 85,755.70
  4. Step 4: Simplify right side
    125,413.30x = 16,107,351,634.10
  5. Step 5: Solve for x
    x = 16,107,351,634.10/125,413.30
  6. Step 6: Final answer
    x = 128,434.16

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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.