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Finding the Fourth Proportional to 783.13, 1,174.95 and 490.82

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Solution

The fourth proportional to 783.13, 1,174.95 and 490.82 is: 736.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    783.13 : 1,174.95 = 490.82 : x
  2. Step 2: Convert to fraction form
    783.13/1,174.95 = 490.82/x
  3. Step 3: Cross multiply
    783.13x = 1,174.95 × 490.82
  4. Step 4: Simplify right side
    783.13x = 576,688.96
  5. Step 5: Solve for x
    x = 576,688.96/783.13
  6. Step 6: Final answer
    x = 736.39

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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.