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Finding the Fourth Proportional to 318,372.95, 439,314.78 and 215,231.60

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Solution

The fourth proportional to 318,372.95, 439,314.78 and 215,231.60 is: 296,992.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    318,372.95 : 439,314.78 = 215,231.60 : x
  2. Step 2: Convert to fraction form
    318,372.95/439,314.78 = 215,231.60/x
  3. Step 3: Cross multiply
    318,372.95x = 439,314.78 × 215,231.60
  4. Step 4: Simplify right side
    318,372.95x = 94,554,420,806.47
  5. Step 5: Solve for x
    x = 94,554,420,806.47/318,372.95
  6. Step 6: Final answer
    x = 296,992.64

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.