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Finding the Fourth Proportional to 782.58, 1,079.98 and 451.07

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Solution

The fourth proportional to 782.58, 1,079.98 and 451.07 is: 622.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    782.58 : 1,079.98 = 451.07 : x
  2. Step 2: Convert to fraction form
    782.58/1,079.98 = 451.07/x
  3. Step 3: Cross multiply
    782.58x = 1,079.98 × 451.07
  4. Step 4: Simplify right side
    782.58x = 487,146.58
  5. Step 5: Solve for x
    x = 487,146.58/782.58
  6. Step 6: Final answer
    x = 622.49

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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.