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Finding the Fourth Proportional to 85,842.91, 128,763.08 and 20,927.58

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Solution

The fourth proportional to 85,842.91, 128,763.08 and 20,927.58 is: 31,391.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,842.91 : 128,763.08 = 20,927.58 : x
  2. Step 2: Convert to fraction form
    85,842.91/128,763.08 = 20,927.58/x
  3. Step 3: Cross multiply
    85,842.91x = 128,763.08 × 20,927.58
  4. Step 4: Simplify right side
    85,842.91x = 2,694,699,657.75
  5. Step 5: Solve for x
    x = 2,694,699,657.75/85,842.91
  6. Step 6: Final answer
    x = 31,391.06

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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.