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Finding the Fourth Proportional to 783.69, 1,174.08 and 393.24

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Solution

The fourth proportional to 783.69, 1,174.08 and 393.24 is: 589.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    783.69 : 1,174.08 = 393.24 : x
  2. Step 2: Convert to fraction form
    783.69/1,174.08 = 393.24/x
  3. Step 3: Cross multiply
    783.69x = 1,174.08 × 393.24
  4. Step 4: Simplify right side
    783.69x = 461,695.22
  5. Step 5: Solve for x
    x = 461,695.22/783.69
  6. Step 6: Final answer
    x = 589.13

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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.