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Finding the Fourth Proportional to 780.66, 1,077.36 and 449.17

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Solution

The fourth proportional to 780.66, 1,077.36 and 449.17 is: 619.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    780.66 : 1,077.36 = 449.17 : x
  2. Step 2: Convert to fraction form
    780.66/1,077.36 = 449.17/x
  3. Step 3: Cross multiply
    780.66x = 1,077.36 × 449.17
  4. Step 4: Simplify right side
    780.66x = 483,917.79
  5. Step 5: Solve for x
    x = 483,917.79/780.66
  6. Step 6: Final answer
    x = 619.88

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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.