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Finding the Fourth Proportional to 122,812.60, 184,218.90 and 85,487.80

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Solution

The fourth proportional to 122,812.60, 184,218.90 and 85,487.80 is: 128,231.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    122,812.60 : 184,218.90 = 85,487.80 : x
  2. Step 2: Convert to fraction form
    122,812.60/184,218.90 = 85,487.80/x
  3. Step 3: Cross multiply
    122,812.60x = 184,218.90 × 85,487.80
  4. Step 4: Simplify right side
    122,812.60x = 15,748,468,479.42
  5. Step 5: Solve for x
    x = 15,748,468,479.42/122,812.60
  6. Step 6: Final answer
    x = 128,231.70

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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.