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Finding the Fourth Proportional to 212,722.80, 319,084.20 and 72,447.60

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Solution

The fourth proportional to 212,722.80, 319,084.20 and 72,447.60 is: 108,671.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    212,722.80 : 319,084.20 = 72,447.60 : x
  2. Step 2: Convert to fraction form
    212,722.80/319,084.20 = 72,447.60/x
  3. Step 3: Cross multiply
    212,722.80x = 319,084.20 × 72,447.60
  4. Step 4: Simplify right side
    212,722.80x = 23,116,884,487.92
  5. Step 5: Solve for x
    x = 23,116,884,487.92/212,722.80
  6. Step 6: Final answer
    x = 108,671.40

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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.