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Finding the Fourth Proportional to 989.59, 1,363.93 and 768.12

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Solution

The fourth proportional to 989.59, 1,363.93 and 768.12 is: 1,058.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    989.59 : 1,363.93 = 768.12 : x
  2. Step 2: Convert to fraction form
    989.59/1,363.93 = 768.12/x
  3. Step 3: Cross multiply
    989.59x = 1,363.93 × 768.12
  4. Step 4: Simplify right side
    989.59x = 1,047,661.91
  5. Step 5: Solve for x
    x = 1,047,661.91/989.59
  6. Step 6: Final answer
    x = 1,058.68

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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.