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Finding the Fourth Proportional to 1,256.31, 1,880.82 and 817.09

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Solution

The fourth proportional to 1,256.31, 1,880.82 and 817.09 is: 1,223.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,256.31 : 1,880.82 = 817.09 : x
  2. Step 2: Convert to fraction form
    1,256.31/1,880.82 = 817.09/x
  3. Step 3: Cross multiply
    1,256.31x = 1,880.82 × 817.09
  4. Step 4: Simplify right side
    1,256.31x = 1,536,794.51
  5. Step 5: Solve for x
    x = 1,536,794.51/1,256.31
  6. Step 6: Final answer
    x = 1,223.26

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1.5x scale

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.