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Finding the Fourth Proportional to 667,378.13, 920,981.81 and 380,892.06

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Solution

The fourth proportional to 667,378.13, 920,981.81 and 380,892.06 is: 525,631.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    667,378.13 : 920,981.81 = 380,892.06 : x
  2. Step 2: Convert to fraction form
    667,378.13/920,981.81 = 380,892.06/x
  3. Step 3: Cross multiply
    667,378.13x = 920,981.81 × 380,892.06
  4. Step 4: Simplify right side
    667,378.13x = 350,794,659,785.66
  5. Step 5: Solve for x
    x = 350,794,659,785.66/667,378.13
  6. Step 6: Final answer
    x = 525,631.04

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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.