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Finding the Fourth Proportional to 783.07, 1,174.37 and 645.78

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Solution

The fourth proportional to 783.07, 1,174.37 and 645.78 is: 968.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    783.07 : 1,174.37 = 645.78 : x
  2. Step 2: Convert to fraction form
    783.07/1,174.37 = 645.78/x
  3. Step 3: Cross multiply
    783.07x = 1,174.37 × 645.78
  4. Step 4: Simplify right side
    783.07x = 758,384.66
  5. Step 5: Solve for x
    x = 758,384.66/783.07
  6. Step 6: Final answer
    x = 968.48

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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.