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Finding the Fourth Proportional to 667,217.12, 920,825.36 and 380,780.32

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Solution

The fourth proportional to 667,217.12, 920,825.36 and 380,780.32 is: 525,514.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    667,217.12 : 920,825.36 = 380,780.32 : x
  2. Step 2: Convert to fraction form
    667,217.12/920,825.36 = 380,780.32/x
  3. Step 3: Cross multiply
    667,217.12x = 920,825.36 × 380,780.32
  4. Step 4: Simplify right side
    667,217.12x = 350,632,175,244.92
  5. Step 5: Solve for x
    x = 350,632,175,244.92/667,217.12
  6. Step 6: Final answer
    x = 525,514.36

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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.