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Finding the Fourth Proportional to 910.12, 1,365.26 and 285.56

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Solution

The fourth proportional to 910.12, 1,365.26 and 285.56 is: 428.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    910.12 : 1,365.26 = 285.56 : x
  2. Step 2: Convert to fraction form
    910.12/1,365.26 = 285.56/x
  3. Step 3: Cross multiply
    910.12x = 1,365.26 × 285.56
  4. Step 4: Simplify right side
    910.12x = 389,860.51
  5. Step 5: Solve for x
    x = 389,860.51/910.12
  6. Step 6: Final answer
    x = 428.36

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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.