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Finding the Fourth Proportional to 782.99, 1,078.07 and 664.72

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Solution

The fourth proportional to 782.99, 1,078.07 and 664.72 is: 915.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    782.99 : 1,078.07 = 664.72 : x
  2. Step 2: Convert to fraction form
    782.99/1,078.07 = 664.72/x
  3. Step 3: Cross multiply
    782.99x = 1,078.07 × 664.72
  4. Step 4: Simplify right side
    782.99x = 716,611.68
  5. Step 5: Solve for x
    x = 716,611.68/782.99
  6. Step 6: Final answer
    x = 915.22

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.