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Finding the Fourth Proportional to 71,639.60, 107,460.30 and 21,720.20

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Solution

The fourth proportional to 71,639.60, 107,460.30 and 21,720.20 is: 32,580.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,639.60 : 107,460.30 = 21,720.20 : x
  2. Step 2: Convert to fraction form
    71,639.60/107,460.30 = 21,720.20/x
  3. Step 3: Cross multiply
    71,639.60x = 107,460.30 × 21,720.20
  4. Step 4: Simplify right side
    71,639.60x = 2,334,059,208.06
  5. Step 5: Solve for x
    x = 2,334,059,208.06/71,639.60
  6. Step 6: Final answer
    x = 32,580.57

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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.