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Finding the Fourth Proportional to 866.92, 1,300.78 and 434.36

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Solution

The fourth proportional to 866.92, 1,300.78 and 434.36 is: 651.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    866.92 : 1,300.78 = 434.36 : x
  2. Step 2: Convert to fraction form
    866.92/1,300.78 = 434.36/x
  3. Step 3: Cross multiply
    866.92x = 1,300.78 × 434.36
  4. Step 4: Simplify right side
    866.92x = 565,006.80
  5. Step 5: Solve for x
    x = 565,006.80/866.92
  6. Step 6: Final answer
    x = 651.74

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.