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Finding the Fourth Proportional to 21,989.80, 32,989.74 and 8,842.60

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Solution

The fourth proportional to 21,989.80, 32,989.74 and 8,842.60 is: 13,265.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,989.80 : 32,989.74 = 8,842.60 : x
  2. Step 2: Convert to fraction form
    21,989.80/32,989.74 = 8,842.60/x
  3. Step 3: Cross multiply
    21,989.80x = 32,989.74 × 8,842.60
  4. Step 4: Simplify right side
    21,989.80x = 291,715,074.92
  5. Step 5: Solve for x
    x = 291,715,074.92/21,989.80
  6. Step 6: Final answer
    x = 13,265.93

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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.