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Finding the Fourth Proportional to 66,486.80, 99,845.40 and 64,413.20

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Solution

The fourth proportional to 66,486.80, 99,845.40 and 64,413.20 is: 96,731.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,486.80 : 99,845.40 = 64,413.20 : x
  2. Step 2: Convert to fraction form
    66,486.80/99,845.40 = 64,413.20/x
  3. Step 3: Cross multiply
    66,486.80x = 99,845.40 × 64,413.20
  4. Step 4: Simplify right side
    66,486.80x = 6,431,361,719.28
  5. Step 5: Solve for x
    x = 6,431,361,719.28/66,486.80
  6. Step 6: Final answer
    x = 96,731.41

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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.