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Finding the Fourth Proportional to 21,808.60, 32,715.30 and 7,960.60

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Solution

The fourth proportional to 21,808.60, 32,715.30 and 7,960.60 is: 11,941.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,808.60 : 32,715.30 = 7,960.60 : x
  2. Step 2: Convert to fraction form
    21,808.60/32,715.30 = 7,960.60/x
  3. Step 3: Cross multiply
    21,808.60x = 32,715.30 × 7,960.60
  4. Step 4: Simplify right side
    21,808.60x = 260,433,417.18
  5. Step 5: Solve for x
    x = 260,433,417.18/21,808.60
  6. Step 6: Final answer
    x = 11,941.78

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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.