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Finding the Fourth Proportional to 90,643.52, 135,984.48 and 28,318.72

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Solution

The fourth proportional to 90,643.52, 135,984.48 and 28,318.72 is: 42,484.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,643.52 : 135,984.48 = 28,318.72 : x
  2. Step 2: Convert to fraction form
    90,643.52/135,984.48 = 28,318.72/x
  3. Step 3: Cross multiply
    90,643.52x = 135,984.48 × 28,318.72
  4. Step 4: Simplify right side
    90,643.52x = 3,850,906,413.47
  5. Step 5: Solve for x
    x = 3,850,906,413.47/90,643.52
  6. Step 6: Final answer
    x = 42,484.08

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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.