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Finding the Fourth Proportional to 1,189.35, 1,783.49 and 772.47

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Solution

The fourth proportional to 1,189.35, 1,783.49 and 772.47 is: 1,158.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,189.35 : 1,783.49 = 772.47 : x
  2. Step 2: Convert to fraction form
    1,189.35/1,783.49 = 772.47/x
  3. Step 3: Cross multiply
    1,189.35x = 1,783.49 × 772.47
  4. Step 4: Simplify right side
    1,189.35x = 1,377,688.66
  5. Step 5: Solve for x
    x = 1,377,688.66/1,189.35
  6. Step 6: Final answer
    x = 1,158.35

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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.