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Finding the Fourth Proportional to 85,388.58, 128,173.05 and 47,980.62

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Solution

The fourth proportional to 85,388.58, 128,173.05 and 47,980.62 is: 72,021.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,388.58 : 128,173.05 = 47,980.62 : x
  2. Step 2: Convert to fraction form
    85,388.58/128,173.05 = 47,980.62/x
  3. Step 3: Cross multiply
    85,388.58x = 128,173.05 × 47,980.62
  4. Step 4: Simplify right side
    85,388.58x = 6,149,822,406.29
  5. Step 5: Solve for x
    x = 6,149,822,406.29/85,388.58
  6. Step 6: Final answer
    x = 72,021.60

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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.