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Finding the Fourth Proportional to 260,029.80, 390,044.70 and 218,039.40

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Solution

The fourth proportional to 260,029.80, 390,044.70 and 218,039.40 is: 327,059.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    260,029.80 : 390,044.70 = 218,039.40 : x
  2. Step 2: Convert to fraction form
    260,029.80/390,044.70 = 218,039.40/x
  3. Step 3: Cross multiply
    260,029.80x = 390,044.70 × 218,039.40
  4. Step 4: Simplify right side
    260,029.80x = 85,045,112,361.18
  5. Step 5: Solve for x
    x = 85,045,112,361.18/260,029.80
  6. Step 6: Final answer
    x = 327,059.10

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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.