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Finding the Fourth Proportional to 260,044.40, 390,066.60 and 221,990.60

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Solution

The fourth proportional to 260,044.40, 390,066.60 and 221,990.60 is: 332,985.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    260,044.40 : 390,066.60 = 221,990.60 : x
  2. Step 2: Convert to fraction form
    260,044.40/390,066.60 = 221,990.60/x
  3. Step 3: Cross multiply
    260,044.40x = 390,066.60 × 221,990.60
  4. Step 4: Simplify right side
    260,044.40x = 86,591,118,573.96
  5. Step 5: Solve for x
    x = 86,591,118,573.96/260,044.40
  6. Step 6: Final answer
    x = 332,985.90

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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.