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Finding the Fourth Proportional to 667,175.43, 920,665.62 and 391,496.16

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Solution

The fourth proportional to 667,175.43, 920,665.62 and 391,496.16 is: 540,243.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    667,175.43 : 920,665.62 = 391,496.16 : x
  2. Step 2: Convert to fraction form
    667,175.43/920,665.62 = 391,496.16/x
  3. Step 3: Cross multiply
    667,175.43x = 920,665.62 × 391,496.16
  4. Step 4: Simplify right side
    667,175.43x = 360,437,054,874.02
  5. Step 5: Solve for x
    x = 360,437,054,874.02/667,175.43
  6. Step 6: Final answer
    x = 540,243.30

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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.