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Finding the Fourth Proportional to 664,386.60, 996,725.70 and 215,128.20

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Solution

The fourth proportional to 664,386.60, 996,725.70 and 215,128.20 is: 322,739.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    664,386.60 : 996,725.70 = 215,128.20 : x
  2. Step 2: Convert to fraction form
    664,386.60/996,725.70 = 215,128.20/x
  3. Step 3: Cross multiply
    664,386.60x = 996,725.70 × 215,128.20
  4. Step 4: Simplify right side
    664,386.60x = 214,423,805,734.74
  5. Step 5: Solve for x
    x = 214,423,805,734.74/664,386.60
  6. Step 6: Final answer
    x = 322,739.51

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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.