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Finding the Fourth Proportional to 1,388.52, 2,083.14 and 511.23

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Solution

The fourth proportional to 1,388.52, 2,083.14 and 511.23 is: 766.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,388.52 : 2,083.14 = 511.23 : x
  2. Step 2: Convert to fraction form
    1,388.52/2,083.14 = 511.23/x
  3. Step 3: Cross multiply
    1,388.52x = 2,083.14 × 511.23
  4. Step 4: Simplify right side
    1,388.52x = 1,064,963.66
  5. Step 5: Solve for x
    x = 1,064,963.66/1,388.52
  6. Step 6: Final answer
    x = 766.98

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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.