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Finding the Fourth Proportional to 667,221.49, 920,831.52 and 380,784.43

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Solution

The fourth proportional to 667,221.49, 920,831.52 and 380,784.43 is: 525,520.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    667,221.49 : 920,831.52 = 380,784.43 : x
  2. Step 2: Convert to fraction form
    667,221.49/920,831.52 = 380,784.43/x
  3. Step 3: Cross multiply
    667,221.49x = 920,831.52 × 380,784.43
  4. Step 4: Simplify right side
    667,221.49x = 350,638,305,469.23
  5. Step 5: Solve for x
    x = 350,638,305,469.23/667,221.49
  6. Step 6: Final answer
    x = 525,520.10

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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.