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Finding the Fourth Proportional to 85,580.76, 128,333.68 and 40,615

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Solution

The fourth proportional to 85,580.76, 128,333.68 and 40,615 is: 60,904.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,580.76 : 128,333.68 = 40,615 : x
  2. Step 2: Convert to fraction form
    85,580.76/128,333.68 = 40,615/x
  3. Step 3: Cross multiply
    85,580.76x = 128,333.68 × 40,615
  4. Step 4: Simplify right side
    85,580.76x = 5,212,272,413.20
  5. Step 5: Solve for x
    x = 5,212,272,413.20/85,580.76
  6. Step 6: Final answer
    x = 60,904.72

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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.