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Finding the Fourth Proportional to 1,222.79, 1,687.47 and 663.28

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Solution

The fourth proportional to 1,222.79, 1,687.47 and 663.28 is: 915.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,222.79 : 1,687.47 = 663.28 : x
  2. Step 2: Convert to fraction form
    1,222.79/1,687.47 = 663.28/x
  3. Step 3: Cross multiply
    1,222.79x = 1,687.47 × 663.28
  4. Step 4: Simplify right side
    1,222.79x = 1,119,267.21
  5. Step 5: Solve for x
    x = 1,119,267.21/1,222.79
  6. Step 6: Final answer
    x = 915.34

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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.