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Finding the Fourth Proportional to 260,734.40, 390,410.40 and 205,438.40

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Solution

The fourth proportional to 260,734.40, 390,410.40 and 205,438.40 is: 307,612.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    260,734.40 : 390,410.40 = 205,438.40 : x
  2. Step 2: Convert to fraction form
    260,734.40/390,410.40 = 205,438.40/x
  3. Step 3: Cross multiply
    260,734.40x = 390,410.40 × 205,438.40
  4. Step 4: Simplify right side
    260,734.40x = 80,205,287,919.36
  5. Step 5: Solve for x
    x = 80,205,287,919.36/260,734.40
  6. Step 6: Final answer
    x = 307,612.99

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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.