Home / 259,990.40-389,985.60-135,315.20

Finding the Fourth Proportional to 259,990.40, 389,985.60 and 135,315.20

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Solution

The fourth proportional to 259,990.40, 389,985.60 and 135,315.20 is: 202,972.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    259,990.40 : 389,985.60 = 135,315.20 : x
  2. Step 2: Convert to fraction form
    259,990.40/389,985.60 = 135,315.20/x
  3. Step 3: Cross multiply
    259,990.40x = 389,985.60 × 135,315.20
  4. Step 4: Simplify right side
    259,990.40x = 52,770,979,461.12
  5. Step 5: Solve for x
    x = 52,770,979,461.12/259,990.40
  6. Step 6: Final answer
    x = 202,972.80

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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.