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Finding the Fourth Proportional to 26,458.88, 39,688.31 and 7,990.88

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Solution

The fourth proportional to 26,458.88, 39,688.31 and 7,990.88 is: 11,986.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    26,458.88 : 39,688.31 = 7,990.88 : x
  2. Step 2: Convert to fraction form
    26,458.88/39,688.31 = 7,990.88/x
  3. Step 3: Cross multiply
    26,458.88x = 39,688.31 × 7,990.88
  4. Step 4: Simplify right side
    26,458.88x = 317,144,344.15
  5. Step 5: Solve for x
    x = 317,144,344.15/26,458.88
  6. Step 6: Final answer
    x = 11,986.31

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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.