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Finding the Fourth Proportional to 906.69, 1,361.70 and 543.70

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Solution

The fourth proportional to 906.69, 1,361.70 and 543.70 is: 816.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    906.69 : 1,361.70 = 543.70 : x
  2. Step 2: Convert to fraction form
    906.69/1,361.70 = 543.70/x
  3. Step 3: Cross multiply
    906.69x = 1,361.70 × 543.70
  4. Step 4: Simplify right side
    906.69x = 740,356.29
  5. Step 5: Solve for x
    x = 740,356.29/906.69
  6. Step 6: Final answer
    x = 816.55

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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.