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Finding the Fourth Proportional to 90,413.80, 135,620.70 and 86,574.40

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Solution

The fourth proportional to 90,413.80, 135,620.70 and 86,574.40 is: 129,861.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,413.80 : 135,620.70 = 86,574.40 : x
  2. Step 2: Convert to fraction form
    90,413.80/135,620.70 = 86,574.40/x
  3. Step 3: Cross multiply
    90,413.80x = 135,620.70 × 86,574.40
  4. Step 4: Simplify right side
    90,413.80x = 11,741,280,730.08
  5. Step 5: Solve for x
    x = 11,741,280,730.08/90,413.80
  6. Step 6: Final answer
    x = 129,861.60

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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.