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Finding the Fourth Proportional to 85,931.52, 128,776.32 and 68,323.20

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Solution

The fourth proportional to 85,931.52, 128,776.32 and 68,323.20 is: 102,388.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,931.52 : 128,776.32 = 68,323.20 : x
  2. Step 2: Convert to fraction form
    85,931.52/128,776.32 = 68,323.20/x
  3. Step 3: Cross multiply
    85,931.52x = 128,776.32 × 68,323.20
  4. Step 4: Simplify right side
    85,931.52x = 8,798,410,266.62
  5. Step 5: Solve for x
    x = 8,798,410,266.62/85,931.52
  6. Step 6: Final answer
    x = 102,388.63

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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.