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Finding the Fourth Proportional to 1,876.16, 2,813.56 and 643.25

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Solution

The fourth proportional to 1,876.16, 2,813.56 and 643.25 is: 964.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,876.16 : 2,813.56 = 643.25 : x
  2. Step 2: Convert to fraction form
    1,876.16/2,813.56 = 643.25/x
  3. Step 3: Cross multiply
    1,876.16x = 2,813.56 × 643.25
  4. Step 4: Simplify right side
    1,876.16x = 1,809,822.47
  5. Step 5: Solve for x
    x = 1,809,822.47/1,876.16
  6. Step 6: Final answer
    x = 964.64

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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.