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Finding the Fourth Proportional to 909.12, 1,362.40 and 681.28

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Solution

The fourth proportional to 909.12, 1,362.40 and 681.28 is: 1,020.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    909.12 : 1,362.40 = 681.28 : x
  2. Step 2: Convert to fraction form
    909.12/1,362.40 = 681.28/x
  3. Step 3: Cross multiply
    909.12x = 1,362.40 × 681.28
  4. Step 4: Simplify right side
    909.12x = 928,175.87
  5. Step 5: Solve for x
    x = 928,175.87/909.12
  6. Step 6: Final answer
    x = 1,020.96

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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.