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Finding the Fourth Proportional to 208,618.12, 312,951.61 and 66,413.59

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Solution

The fourth proportional to 208,618.12, 312,951.61 and 66,413.59 is: 99,628.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    208,618.12 : 312,951.61 = 66,413.59 : x
  2. Step 2: Convert to fraction form
    208,618.12/312,951.61 = 66,413.59/x
  3. Step 3: Cross multiply
    208,618.12x = 312,951.61 × 66,413.59
  4. Step 4: Simplify right side
    208,618.12x = 20,784,238,185.59
  5. Step 5: Solve for x
    x = 20,784,238,185.59/208,618.12
  6. Step 6: Final answer
    x = 99,628.16

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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.