Home / 1,421.28-1,960.20-1,090.50

Finding the Fourth Proportional to 1,421.28, 1,960.20 and 1,090.50

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Solution

The fourth proportional to 1,421.28, 1,960.20 and 1,090.50 is: 1,503.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,421.28 : 1,960.20 = 1,090.50 : x
  2. Step 2: Convert to fraction form
    1,421.28/1,960.20 = 1,090.50/x
  3. Step 3: Cross multiply
    1,421.28x = 1,960.20 × 1,090.50
  4. Step 4: Simplify right side
    1,421.28x = 2,137,590.75
  5. Step 5: Solve for x
    x = 2,137,590.75/1,421.28
  6. Step 6: Final answer
    x = 1,503.99

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.