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Finding the Fourth Proportional to 1,680.71, 2,521.05 and 640.47

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Solution

The fourth proportional to 1,680.71, 2,521.05 and 640.47 is: 960.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,680.71 : 2,521.05 = 640.47 : x
  2. Step 2: Convert to fraction form
    1,680.71/2,521.05 = 640.47/x
  3. Step 3: Cross multiply
    1,680.71x = 2,521.05 × 640.47
  4. Step 4: Simplify right side
    1,680.71x = 1,614,656.89
  5. Step 5: Solve for x
    x = 1,614,656.89/1,680.71
  6. Step 6: Final answer
    x = 960.70

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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.