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Finding the Fourth Proportional to 85,818.30, 128,765.85 and 39,047.10

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Solution

The fourth proportional to 85,818.30, 128,765.85 and 39,047.10 is: 58,588.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,818.30 : 128,765.85 = 39,047.10 : x
  2. Step 2: Convert to fraction form
    85,818.30/128,765.85 = 39,047.10/x
  3. Step 3: Cross multiply
    85,818.30x = 128,765.85 × 39,047.10
  4. Step 4: Simplify right side
    85,818.30x = 5,027,933,021.54
  5. Step 5: Solve for x
    x = 5,027,933,021.54/85,818.30
  6. Step 6: Final answer
    x = 58,588.12

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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.