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Finding the Fourth Proportional to 212,640.60, 318,960.90 and 128,659.80

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Solution

The fourth proportional to 212,640.60, 318,960.90 and 128,659.80 is: 192,989.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    212,640.60 : 318,960.90 = 128,659.80 : x
  2. Step 2: Convert to fraction form
    212,640.60/318,960.90 = 128,659.80/x
  3. Step 3: Cross multiply
    212,640.60x = 318,960.90 × 128,659.80
  4. Step 4: Simplify right side
    212,640.60x = 41,037,445,601.82
  5. Step 5: Solve for x
    x = 41,037,445,601.82/212,640.60
  6. Step 6: Final answer
    x = 192,989.70

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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.