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Finding the Fourth Proportional to 783.99, 1,079.44 and 665.72

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Solution

The fourth proportional to 783.99, 1,079.44 and 665.72 is: 916.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    783.99 : 1,079.44 = 665.72 : x
  2. Step 2: Convert to fraction form
    783.99/1,079.44 = 665.72/x
  3. Step 3: Cross multiply
    783.99x = 1,079.44 × 665.72
  4. Step 4: Simplify right side
    783.99x = 718,604.80
  5. Step 5: Solve for x
    x = 718,604.80/783.99
  6. Step 6: Final answer
    x = 916.60

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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.