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Finding the Fourth Proportional to 891.36, 1,336.70 and 429.03

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Solution

The fourth proportional to 891.36, 1,336.70 and 429.03 is: 643.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    891.36 : 1,336.70 = 429.03 : x
  2. Step 2: Convert to fraction form
    891.36/1,336.70 = 429.03/x
  3. Step 3: Cross multiply
    891.36x = 1,336.70 × 429.03
  4. Step 4: Simplify right side
    891.36x = 573,485.47
  5. Step 5: Solve for x
    x = 573,485.47/891.36
  6. Step 6: Final answer
    x = 643.38

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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.