Home / 280,421.40-420,632.10-130,611.90

Finding the Fourth Proportional to 280,421.40, 420,632.10 and 130,611.90

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Solution

The fourth proportional to 280,421.40, 420,632.10 and 130,611.90 is: 195,917.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    280,421.40 : 420,632.10 = 130,611.90 : x
  2. Step 2: Convert to fraction form
    280,421.40/420,632.10 = 130,611.90/x
  3. Step 3: Cross multiply
    280,421.40x = 420,632.10 × 130,611.90
  4. Step 4: Simplify right side
    280,421.40x = 54,939,557,781.99
  5. Step 5: Solve for x
    x = 54,939,557,781.99/280,421.40
  6. Step 6: Final answer
    x = 195,917.85

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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.