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Finding the Fourth Proportional to 1,681.07, 2,519.82 and 640.40

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Solution

The fourth proportional to 1,681.07, 2,519.82 and 640.40 is: 959.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,681.07 : 2,519.82 = 640.40 : x
  2. Step 2: Convert to fraction form
    1,681.07/2,519.82 = 640.40/x
  3. Step 3: Cross multiply
    1,681.07x = 2,519.82 × 640.40
  4. Step 4: Simplify right side
    1,681.07x = 1,613,680.13
  5. Step 5: Solve for x
    x = 1,613,680.13/1,681.07
  6. Step 6: Final answer
    x = 959.92

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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.