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Finding the Fourth Proportional to 909.96, 1,355.25 and 898.68

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Solution

The fourth proportional to 909.96, 1,355.25 and 898.68 is: 1,338.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    909.96 : 1,355.25 = 898.68 : x
  2. Step 2: Convert to fraction form
    909.96/1,355.25 = 898.68/x
  3. Step 3: Cross multiply
    909.96x = 1,355.25 × 898.68
  4. Step 4: Simplify right side
    909.96x = 1,217,936.07
  5. Step 5: Solve for x
    x = 1,217,936.07/909.96
  6. Step 6: Final answer
    x = 1,338.45

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.