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Finding the Fourth Proportional to 1,238.35, 1,709.10 and 714.28

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Solution

The fourth proportional to 1,238.35, 1,709.10 and 714.28 is: 985.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,238.35 : 1,709.10 = 714.28 : x
  2. Step 2: Convert to fraction form
    1,238.35/1,709.10 = 714.28/x
  3. Step 3: Cross multiply
    1,238.35x = 1,709.10 × 714.28
  4. Step 4: Simplify right side
    1,238.35x = 1,220,775.95
  5. Step 5: Solve for x
    x = 1,220,775.95/1,238.35
  6. Step 6: Final answer
    x = 985.81

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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.