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Finding the Fourth Proportional to 910.89, 1,365.81 and 423.47

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Solution

The fourth proportional to 910.89, 1,365.81 and 423.47 is: 634.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    910.89 : 1,365.81 = 423.47 : x
  2. Step 2: Convert to fraction form
    910.89/1,365.81 = 423.47/x
  3. Step 3: Cross multiply
    910.89x = 1,365.81 × 423.47
  4. Step 4: Simplify right side
    910.89x = 578,372.73
  5. Step 5: Solve for x
    x = 578,372.73/910.89
  6. Step 6: Final answer
    x = 634.95

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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.