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Finding the Fourth Proportional to 661,110.20, 991,665.30 and 217,820.60

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Solution

The fourth proportional to 661,110.20, 991,665.30 and 217,820.60 is: 326,730.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    661,110.20 : 991,665.30 = 217,820.60 : x
  2. Step 2: Convert to fraction form
    661,110.20/991,665.30 = 217,820.60/x
  3. Step 3: Cross multiply
    661,110.20x = 991,665.30 × 217,820.60
  4. Step 4: Simplify right side
    661,110.20x = 216,005,130,645.18
  5. Step 5: Solve for x
    x = 216,005,130,645.18/661,110.20
  6. Step 6: Final answer
    x = 326,730.90

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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.