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Finding the Fourth Proportional to 761.91, 1,136.97 and 684.36

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Solution

The fourth proportional to 761.91, 1,136.97 and 684.36 is: 1,021.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    761.91 : 1,136.97 = 684.36 : x
  2. Step 2: Convert to fraction form
    761.91/1,136.97 = 684.36/x
  3. Step 3: Cross multiply
    761.91x = 1,136.97 × 684.36
  4. Step 4: Simplify right side
    761.91x = 778,096.79
  5. Step 5: Solve for x
    x = 778,096.79/761.91
  6. Step 6: Final answer
    x = 1,021.25

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.