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Finding the Fourth Proportional to 1,238.51, 1,708.84 and 714.54

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Solution

The fourth proportional to 1,238.51, 1,708.84 and 714.54 is: 985.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,238.51 : 1,708.84 = 714.54 : x
  2. Step 2: Convert to fraction form
    1,238.51/1,708.84 = 714.54/x
  3. Step 3: Cross multiply
    1,238.51x = 1,708.84 × 714.54
  4. Step 4: Simplify right side
    1,238.51x = 1,221,024.20
  5. Step 5: Solve for x
    x = 1,221,024.20/1,238.51
  6. Step 6: Final answer
    x = 985.89

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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.