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Finding the Fourth Proportional to 1,877.39, 2,816.43 and 644.76

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Solution

The fourth proportional to 1,877.39, 2,816.43 and 644.76 is: 967.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,877.39 : 2,816.43 = 644.76 : x
  2. Step 2: Convert to fraction form
    1,877.39/2,816.43 = 644.76/x
  3. Step 3: Cross multiply
    1,877.39x = 2,816.43 × 644.76
  4. Step 4: Simplify right side
    1,877.39x = 1,815,921.41
  5. Step 5: Solve for x
    x = 1,815,921.41/1,877.39
  6. Step 6: Final answer
    x = 967.26

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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.