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Finding the Fourth Proportional to 85,760.86, 128,635.08 and 28,835.14

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Solution

The fourth proportional to 85,760.86, 128,635.08 and 28,835.14 is: 43,250.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,760.86 : 128,635.08 = 28,835.14 : x
  2. Step 2: Convert to fraction form
    85,760.86/128,635.08 = 28,835.14/x
  3. Step 3: Cross multiply
    85,760.86x = 128,635.08 × 28,835.14
  4. Step 4: Simplify right side
    85,760.86x = 3,709,210,540.71
  5. Step 5: Solve for x
    x = 3,709,210,540.71/85,760.86
  6. Step 6: Final answer
    x = 43,250.62

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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.