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Finding the Fourth Proportional to 120,861.60, 181,486.80 and 87,813.60

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Solution

The fourth proportional to 120,861.60, 181,486.80 and 87,813.60 is: 131,861.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    120,861.60 : 181,486.80 = 87,813.60 : x
  2. Step 2: Convert to fraction form
    120,861.60/181,486.80 = 87,813.60/x
  3. Step 3: Cross multiply
    120,861.60x = 181,486.80 × 87,813.60
  4. Step 4: Simplify right side
    120,861.60x = 15,937,009,260.48
  5. Step 5: Solve for x
    x = 15,937,009,260.48/120,861.60
  6. Step 6: Final answer
    x = 131,861.64

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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.