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Finding the Fourth Proportional to 422,987.60, 634,327.80 and 212,555.60

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Solution

The fourth proportional to 422,987.60, 634,327.80 and 212,555.60 is: 318,756.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    422,987.60 : 634,327.80 = 212,555.60 : x
  2. Step 2: Convert to fraction form
    422,987.60/634,327.80 = 212,555.60/x
  3. Step 3: Cross multiply
    422,987.60x = 634,327.80 × 212,555.60
  4. Step 4: Simplify right side
    422,987.60x = 134,829,926,125.68
  5. Step 5: Solve for x
    x = 134,829,926,125.68/422,987.60
  6. Step 6: Final answer
    x = 318,756.21

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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.