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Finding the Fourth Proportional to 661,638.60, 991,971.90 and 262,081.80

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Solution

The fourth proportional to 661,638.60, 991,971.90 and 262,081.80 is: 392,930.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    661,638.60 : 991,971.90 = 262,081.80 : x
  2. Step 2: Convert to fraction form
    661,638.60/991,971.90 = 262,081.80/x
  3. Step 3: Cross multiply
    661,638.60x = 991,971.90 × 262,081.80
  4. Step 4: Simplify right side
    661,638.60x = 259,977,781,101.42
  5. Step 5: Solve for x
    x = 259,977,781,101.42/661,638.60
  6. Step 6: Final answer
    x = 392,930.19

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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.