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Finding the Fourth Proportional to 85,839.80, 128,798.10 and 39,068.60

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Solution

The fourth proportional to 85,839.80, 128,798.10 and 39,068.60 is: 58,620.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,839.80 : 128,798.10 = 39,068.60 : x
  2. Step 2: Convert to fraction form
    85,839.80/128,798.10 = 39,068.60/x
  3. Step 3: Cross multiply
    85,839.80x = 128,798.10 × 39,068.60
  4. Step 4: Simplify right side
    85,839.80x = 5,031,961,449.66
  5. Step 5: Solve for x
    x = 5,031,961,449.66/85,839.80
  6. Step 6: Final answer
    x = 58,620.38

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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.