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Finding the Fourth Proportional to 28,931.60, 43,413.60 and 12,288.80

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Solution

The fourth proportional to 28,931.60, 43,413.60 and 12,288.80 is: 18,440.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,931.60 : 43,413.60 = 12,288.80 : x
  2. Step 2: Convert to fraction form
    28,931.60/43,413.60 = 12,288.80/x
  3. Step 3: Cross multiply
    28,931.60x = 43,413.60 × 12,288.80
  4. Step 4: Simplify right side
    28,931.60x = 533,501,047.68
  5. Step 5: Solve for x
    x = 533,501,047.68/28,931.60
  6. Step 6: Final answer
    x = 18,440.08

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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.