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Finding the Fourth Proportional to 909.05, 1,361.99 and 715.28

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Solution

The fourth proportional to 909.05, 1,361.99 and 715.28 is: 1,071.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    909.05 : 1,361.99 = 715.28 : x
  2. Step 2: Convert to fraction form
    909.05/1,361.99 = 715.28/x
  3. Step 3: Cross multiply
    909.05x = 1,361.99 × 715.28
  4. Step 4: Simplify right side
    909.05x = 974,209.40
  5. Step 5: Solve for x
    x = 974,209.40/909.05
  6. Step 6: Final answer
    x = 1,071.68

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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.