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Finding the Fourth Proportional to 85,821.80, 128,732.70 and 39,165.80

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Solution

The fourth proportional to 85,821.80, 128,732.70 and 39,165.80 is: 58,748.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,821.80 : 128,732.70 = 39,165.80 : x
  2. Step 2: Convert to fraction form
    85,821.80/128,732.70 = 39,165.80/x
  3. Step 3: Cross multiply
    85,821.80x = 128,732.70 × 39,165.80
  4. Step 4: Simplify right side
    85,821.80x = 5,041,919,181.66
  5. Step 5: Solve for x
    x = 5,041,919,181.66/85,821.80
  6. Step 6: Final answer
    x = 58,748.70

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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.