Home / 2,142.90-3,214.29-909.93

Finding the Fourth Proportional to 2,142.90, 3,214.29 and 909.93

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Solution

The fourth proportional to 2,142.90, 3,214.29 and 909.93 is: 1,364.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,142.90 : 3,214.29 = 909.93 : x
  2. Step 2: Convert to fraction form
    2,142.90/3,214.29 = 909.93/x
  3. Step 3: Cross multiply
    2,142.90x = 3,214.29 × 909.93
  4. Step 4: Simplify right side
    2,142.90x = 2,924,778.90
  5. Step 5: Solve for x
    x = 2,924,778.90/2,142.90
  6. Step 6: Final answer
    x = 1,364.87

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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.