Home / 1,420.46-2,131.52-640.50

Finding the Fourth Proportional to 1,420.46, 2,131.52 and 640.50

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Solution

The fourth proportional to 1,420.46, 2,131.52 and 640.50 is: 961.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,420.46 : 2,131.52 = 640.50 : x
  2. Step 2: Convert to fraction form
    1,420.46/2,131.52 = 640.50/x
  3. Step 3: Cross multiply
    1,420.46x = 2,131.52 × 640.50
  4. Step 4: Simplify right side
    1,420.46x = 1,365,235.36
  5. Step 5: Solve for x
    x = 1,365,235.36/1,420.46
  6. Step 6: Final answer
    x = 961.13

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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.