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Finding the Fourth Proportional to 1,877.81, 2,816.90 and 645.05

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Solution

The fourth proportional to 1,877.81, 2,816.90 and 645.05 is: 967.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,877.81 : 2,816.90 = 645.05 : x
  2. Step 2: Convert to fraction form
    1,877.81/2,816.90 = 645.05/x
  3. Step 3: Cross multiply
    1,877.81x = 2,816.90 × 645.05
  4. Step 4: Simplify right side
    1,877.81x = 1,817,047.58
  5. Step 5: Solve for x
    x = 1,817,047.58/1,877.81
  6. Step 6: Final answer
    x = 967.64

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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.