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Finding the Fourth Proportional to 664,388.60, 996,728.70 and 215,130.20

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Solution

The fourth proportional to 664,388.60, 996,728.70 and 215,130.20 is: 322,742.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    664,388.60 : 996,728.70 = 215,130.20 : x
  2. Step 2: Convert to fraction form
    664,388.60/996,728.70 = 215,130.20/x
  3. Step 3: Cross multiply
    664,388.60x = 996,728.70 × 215,130.20
  4. Step 4: Simplify right side
    664,388.60x = 214,426,444,576.74
  5. Step 5: Solve for x
    x = 214,426,444,576.74/664,388.60
  6. Step 6: Final answer
    x = 322,742.51

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Similar ratio
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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.