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Finding the Fourth Proportional to 1,876.16, 2,813.09 and 643.47

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Solution

The fourth proportional to 1,876.16, 2,813.09 and 643.47 is: 964.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,876.16 : 2,813.09 = 643.47 : x
  2. Step 2: Convert to fraction form
    1,876.16/2,813.09 = 643.47/x
  3. Step 3: Cross multiply
    1,876.16x = 2,813.09 × 643.47
  4. Step 4: Simplify right side
    1,876.16x = 1,810,135.80
  5. Step 5: Solve for x
    x = 1,810,135.80/1,876.16
  6. Step 6: Final answer
    x = 964.81

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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.