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Finding the Fourth Proportional to 1,238.35, 1,709.08 and 714.38

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Solution

The fourth proportional to 1,238.35, 1,709.08 and 714.38 is: 985.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,238.35 : 1,709.08 = 714.38 : x
  2. Step 2: Convert to fraction form
    1,238.35/1,709.08 = 714.38/x
  3. Step 3: Cross multiply
    1,238.35x = 1,709.08 × 714.38
  4. Step 4: Simplify right side
    1,238.35x = 1,220,932.57
  5. Step 5: Solve for x
    x = 1,220,932.57/1,238.35
  6. Step 6: Final answer
    x = 985.93

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1.5x scale

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.