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Finding the Fourth Proportional to 783.26, 1,174.64 and 417.84

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Solution

The fourth proportional to 783.26, 1,174.64 and 417.84 is: 626.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    783.26 : 1,174.64 = 417.84 : x
  2. Step 2: Convert to fraction form
    783.26/1,174.64 = 417.84/x
  3. Step 3: Cross multiply
    783.26x = 1,174.64 × 417.84
  4. Step 4: Simplify right side
    783.26x = 490,811.58
  5. Step 5: Solve for x
    x = 490,811.58/783.26
  6. Step 6: Final answer
    x = 626.63

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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.