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Finding the Fourth Proportional to 991.07, 1,484.68 and 768.87

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Solution

The fourth proportional to 991.07, 1,484.68 and 768.87 is: 1,151.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    991.07 : 1,484.68 = 768.87 : x
  2. Step 2: Convert to fraction form
    991.07/1,484.68 = 768.87/x
  3. Step 3: Cross multiply
    991.07x = 1,484.68 × 768.87
  4. Step 4: Simplify right side
    991.07x = 1,141,523.69
  5. Step 5: Solve for x
    x = 1,141,523.69/991.07
  6. Step 6: Final answer
    x = 1,151.81

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.