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Finding the Fourth Proportional to 1,388.84, 2,068.31 and 1,305

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Solution

The fourth proportional to 1,388.84, 2,068.31 and 1,305 is: 1,943.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,388.84 : 2,068.31 = 1,305 : x
  2. Step 2: Convert to fraction form
    1,388.84/2,068.31 = 1,305/x
  3. Step 3: Cross multiply
    1,388.84x = 2,068.31 × 1,305
  4. Step 4: Simplify right side
    1,388.84x = 2,699,147.81
  5. Step 5: Solve for x
    x = 2,699,147.81/1,388.84
  6. Step 6: Final answer
    x = 1,943.46

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.