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Finding the Fourth Proportional to 318,967.35, 439,980.30 and 189,819.20

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Solution

The fourth proportional to 318,967.35, 439,980.30 and 189,819.20 is: 261,834.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    318,967.35 : 439,980.30 = 189,819.20 : x
  2. Step 2: Convert to fraction form
    318,967.35/439,980.30 = 189,819.20/x
  3. Step 3: Cross multiply
    318,967.35x = 439,980.30 × 189,819.20
  4. Step 4: Simplify right side
    318,967.35x = 83,516,706,361.86
  5. Step 5: Solve for x
    x = 83,516,706,361.86/318,967.35
  6. Step 6: Final answer
    x = 261,834.66

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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.