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Finding the Fourth Proportional to 667,218.12, 920,826.74 and 380,781.32

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Solution

The fourth proportional to 667,218.12, 920,826.74 and 380,781.32 is: 525,515.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    667,218.12 : 920,826.74 = 380,781.32 : x
  2. Step 2: Convert to fraction form
    667,218.12/920,826.74 = 380,781.32/x
  3. Step 3: Cross multiply
    667,218.12x = 920,826.74 × 380,781.32
  4. Step 4: Simplify right side
    667,218.12x = 350,633,621,548.50
  5. Step 5: Solve for x
    x = 350,633,621,548.50/667,218.12
  6. Step 6: Final answer
    x = 525,515.74

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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.