Home / 1,335.10-2,001.30-640.75

Finding the Fourth Proportional to 1,335.10, 2,001.30 and 640.75

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Solution

The fourth proportional to 1,335.10, 2,001.30 and 640.75 is: 960.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,335.10 : 2,001.30 = 640.75 : x
  2. Step 2: Convert to fraction form
    1,335.10/2,001.30 = 640.75/x
  3. Step 3: Cross multiply
    1,335.10x = 2,001.30 × 640.75
  4. Step 4: Simplify right side
    1,335.10x = 1,282,332.98
  5. Step 5: Solve for x
    x = 1,282,332.98/1,335.10
  6. Step 6: Final answer
    x = 960.48

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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.