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Finding the Fourth Proportional to 782.13, 1,172.16 and 416.13

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Solution

The fourth proportional to 782.13, 1,172.16 and 416.13 is: 623.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    782.13 : 1,172.16 = 416.13 : x
  2. Step 2: Convert to fraction form
    782.13/1,172.16 = 416.13/x
  3. Step 3: Cross multiply
    782.13x = 1,172.16 × 416.13
  4. Step 4: Simplify right side
    782.13x = 487,770.94
  5. Step 5: Solve for x
    x = 487,770.94/782.13
  6. Step 6: Final answer
    x = 623.64

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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.