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Finding the Fourth Proportional to 318,346.90, 477,520.65 and 78,460.81

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Solution

The fourth proportional to 318,346.90, 477,520.65 and 78,460.81 is: 117,691.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    318,346.90 : 477,520.65 = 78,460.81 : x
  2. Step 2: Convert to fraction form
    318,346.90/477,520.65 = 78,460.81/x
  3. Step 3: Cross multiply
    318,346.90x = 477,520.65 × 78,460.81
  4. Step 4: Simplify right side
    318,346.90x = 37,466,655,796.92
  5. Step 5: Solve for x
    x = 37,466,655,796.92/318,346.90
  6. Step 6: Final answer
    x = 117,691.29

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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.