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Finding the Fourth Proportional to 85,989.60, 128,996.55 and 26,819.10

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Solution

The fourth proportional to 85,989.60, 128,996.55 and 26,819.10 is: 40,232.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,989.60 : 128,996.55 = 26,819.10 : x
  2. Step 2: Convert to fraction form
    85,989.60/128,996.55 = 26,819.10/x
  3. Step 3: Cross multiply
    85,989.60x = 128,996.55 × 26,819.10
  4. Step 4: Simplify right side
    85,989.60x = 3,459,571,374.11
  5. Step 5: Solve for x
    x = 3,459,571,374.11/85,989.60
  6. Step 6: Final answer
    x = 40,232.44

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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.