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Finding the Fourth Proportional to 1,238.58, 1,709.44 and 707.49

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Solution

The fourth proportional to 1,238.58, 1,709.44 and 707.49 is: 976.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,238.58 : 1,709.44 = 707.49 : x
  2. Step 2: Convert to fraction form
    1,238.58/1,709.44 = 707.49/x
  3. Step 3: Cross multiply
    1,238.58x = 1,709.44 × 707.49
  4. Step 4: Simplify right side
    1,238.58x = 1,209,409.94
  5. Step 5: Solve for x
    x = 1,209,409.94/1,238.58
  6. Step 6: Final answer
    x = 976.45

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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.