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Finding the Fourth Proportional to 122,413.20, 183,619.80 and 72,646.80

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Solution

The fourth proportional to 122,413.20, 183,619.80 and 72,646.80 is: 108,970.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    122,413.20 : 183,619.80 = 72,646.80 : x
  2. Step 2: Convert to fraction form
    122,413.20/183,619.80 = 72,646.80/x
  3. Step 3: Cross multiply
    122,413.20x = 183,619.80 × 72,646.80
  4. Step 4: Simplify right side
    122,413.20x = 13,339,390,886.64
  5. Step 5: Solve for x
    x = 13,339,390,886.64/122,413.20
  6. Step 6: Final answer
    x = 108,970.20

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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.