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Finding the Fourth Proportional to 318,299.40, 477,447.50 and 78,412.83

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Solution

The fourth proportional to 318,299.40, 477,447.50 and 78,412.83 is: 117,618.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    318,299.40 : 477,447.50 = 78,412.83 : x
  2. Step 2: Convert to fraction form
    318,299.40/477,447.50 = 78,412.83/x
  3. Step 3: Cross multiply
    318,299.40x = 477,447.50 × 78,412.83
  4. Step 4: Simplify right side
    318,299.40x = 37,438,011,975.23
  5. Step 5: Solve for x
    x = 37,438,011,975.23/318,299.40
  6. Step 6: Final answer
    x = 117,618.86

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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.