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Finding the Fourth Proportional to 1,207.31, 1,664.67 and 787.07

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Solution

The fourth proportional to 1,207.31, 1,664.67 and 787.07 is: 1,085.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,207.31 : 1,664.67 = 787.07 : x
  2. Step 2: Convert to fraction form
    1,207.31/1,664.67 = 787.07/x
  3. Step 3: Cross multiply
    1,207.31x = 1,664.67 × 787.07
  4. Step 4: Simplify right side
    1,207.31x = 1,310,211.82
  5. Step 5: Solve for x
    x = 1,310,211.82/1,207.31
  6. Step 6: Final answer
    x = 1,085.23

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.