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Finding the Fourth Proportional to 1,877.68, 2,816.91 and 644.80

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Solution

The fourth proportional to 1,877.68, 2,816.91 and 644.80 is: 967.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,877.68 : 2,816.91 = 644.80 : x
  2. Step 2: Convert to fraction form
    1,877.68/2,816.91 = 644.80/x
  3. Step 3: Cross multiply
    1,877.68x = 2,816.91 × 644.80
  4. Step 4: Simplify right side
    1,877.68x = 1,816,343.57
  5. Step 5: Solve for x
    x = 1,816,343.57/1,877.68
  6. Step 6: Final answer
    x = 967.33

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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.