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Finding the Fourth Proportional to 42,657.60, 63,986.40 and 28,660.80

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Solution

The fourth proportional to 42,657.60, 63,986.40 and 28,660.80 is: 42,991.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    42,657.60 : 63,986.40 = 28,660.80 : x
  2. Step 2: Convert to fraction form
    42,657.60/63,986.40 = 28,660.80/x
  3. Step 3: Cross multiply
    42,657.60x = 63,986.40 × 28,660.80
  4. Step 4: Simplify right side
    42,657.60x = 1,833,901,413.12
  5. Step 5: Solve for x
    x = 1,833,901,413.12/42,657.60
  6. Step 6: Final answer
    x = 42,991.20

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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.