Home / 280,919.39-421,421.04-103,412.90

Finding the Fourth Proportional to 280,919.39, 421,421.04 and 103,412.90

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Solution

The fourth proportional to 280,919.39, 421,421.04 and 103,412.90 is: 155,134.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    280,919.39 : 421,421.04 = 103,412.90 : x
  2. Step 2: Convert to fraction form
    280,919.39/421,421.04 = 103,412.90/x
  3. Step 3: Cross multiply
    280,919.39x = 421,421.04 × 103,412.90
  4. Step 4: Simplify right side
    280,919.39x = 43,580,369,760.31
  5. Step 5: Solve for x
    x = 43,580,369,760.31/280,919.39
  6. Step 6: Final answer
    x = 155,134.79

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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.