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Finding the Fourth Proportional to 318,313.08, 477,469.74 and 81,655.76

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Solution

The fourth proportional to 318,313.08, 477,469.74 and 81,655.76 is: 122,483.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    318,313.08 : 477,469.74 = 81,655.76 : x
  2. Step 2: Convert to fraction form
    318,313.08/477,469.74 = 81,655.76/x
  3. Step 3: Cross multiply
    318,313.08x = 477,469.74 × 81,655.76
  4. Step 4: Simplify right side
    318,313.08x = 38,988,154,496.70
  5. Step 5: Solve for x
    x = 38,988,154,496.70/318,313.08
  6. Step 6: Final answer
    x = 122,483.67

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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.