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Finding the Fourth Proportional to 1,238.48, 1,707.68 and 989.63

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Solution

The fourth proportional to 1,238.48, 1,707.68 and 989.63 is: 1,364.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,238.48 : 1,707.68 = 989.63 : x
  2. Step 2: Convert to fraction form
    1,238.48/1,707.68 = 989.63/x
  3. Step 3: Cross multiply
    1,238.48x = 1,707.68 × 989.63
  4. Step 4: Simplify right side
    1,238.48x = 1,689,965.29
  5. Step 5: Solve for x
    x = 1,689,965.29/1,238.48
  6. Step 6: Final answer
    x = 1,364.55

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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.