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Finding the Fourth Proportional to 260,015.40, 389,439.90 and 213,359.40

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Solution

The fourth proportional to 260,015.40, 389,439.90 and 213,359.40 is: 319,560.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    260,015.40 : 389,439.90 = 213,359.40 : x
  2. Step 2: Convert to fraction form
    260,015.40/389,439.90 = 213,359.40/x
  3. Step 3: Cross multiply
    260,015.40x = 389,439.90 × 213,359.40
  4. Step 4: Simplify right side
    260,015.40x = 83,090,663,400.06
  5. Step 5: Solve for x
    x = 83,090,663,400.06/260,015.40
  6. Step 6: Final answer
    x = 319,560.55

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1.5x scale

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.