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Finding the Fourth Proportional to 613,645.20, 920,905.20 and 347,122.80

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Solution

The fourth proportional to 613,645.20, 920,905.20 and 347,122.80 is: 520,931.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    613,645.20 : 920,905.20 = 347,122.80 : x
  2. Step 2: Convert to fraction form
    613,645.20/920,905.20 = 347,122.80/x
  3. Step 3: Cross multiply
    613,645.20x = 920,905.20 × 347,122.80
  4. Step 4: Simplify right side
    613,645.20x = 319,667,191,558.56
  5. Step 5: Solve for x
    x = 319,667,191,558.56/613,645.20
  6. Step 6: Final answer
    x = 520,931.63

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.