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Finding the Fourth Proportional to 782.56, 1,172.64 and 619.84

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Solution

The fourth proportional to 782.56, 1,172.64 and 619.84 is: 928.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    782.56 : 1,172.64 = 619.84 : x
  2. Step 2: Convert to fraction form
    782.56/1,172.64 = 619.84/x
  3. Step 3: Cross multiply
    782.56x = 1,172.64 × 619.84
  4. Step 4: Simplify right side
    782.56x = 726,849.18
  5. Step 5: Solve for x
    x = 726,849.18/782.56
  6. Step 6: Final answer
    x = 928.81

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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.