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Finding the Fourth Proportional to 1,224.80, 1,688.24 and 893.28

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Solution

The fourth proportional to 1,224.80, 1,688.24 and 893.28 is: 1,231.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,224.80 : 1,688.24 = 893.28 : x
  2. Step 2: Convert to fraction form
    1,224.80/1,688.24 = 893.28/x
  3. Step 3: Cross multiply
    1,224.80x = 1,688.24 × 893.28
  4. Step 4: Simplify right side
    1,224.80x = 1,508,071.03
  5. Step 5: Solve for x
    x = 1,508,071.03/1,224.80
  6. Step 6: Final answer
    x = 1,231.28

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.