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Finding the Fourth Proportional to 2,171.08, 3,256.66 and 783.45

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Solution

The fourth proportional to 2,171.08, 3,256.66 and 783.45 is: 1,175.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,171.08 : 3,256.66 = 783.45 : x
  2. Step 2: Convert to fraction form
    2,171.08/3,256.66 = 783.45/x
  3. Step 3: Cross multiply
    2,171.08x = 3,256.66 × 783.45
  4. Step 4: Simplify right side
    2,171.08x = 2,551,417.69
  5. Step 5: Solve for x
    x = 2,551,417.69/2,171.08
  6. Step 6: Final answer
    x = 1,175.18

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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.