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Finding the Fourth Proportional to 70,413.60, 105,620.40 and 28,890.40

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Solution

The fourth proportional to 70,413.60, 105,620.40 and 28,890.40 is: 43,335.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,413.60 : 105,620.40 = 28,890.40 : x
  2. Step 2: Convert to fraction form
    70,413.60/105,620.40 = 28,890.40/x
  3. Step 3: Cross multiply
    70,413.60x = 105,620.40 × 28,890.40
  4. Step 4: Simplify right side
    70,413.60x = 3,051,415,604.16
  5. Step 5: Solve for x
    x = 3,051,415,604.16/70,413.60
  6. Step 6: Final answer
    x = 43,335.60

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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.