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Finding the Fourth Proportional to 1,663.79, 2,495.67 and 688.81

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Solution

The fourth proportional to 1,663.79, 2,495.67 and 688.81 is: 1,033.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,663.79 : 2,495.67 = 688.81 : x
  2. Step 2: Convert to fraction form
    1,663.79/2,495.67 = 688.81/x
  3. Step 3: Cross multiply
    1,663.79x = 2,495.67 × 688.81
  4. Step 4: Simplify right side
    1,663.79x = 1,719,042.45
  5. Step 5: Solve for x
    x = 1,719,042.45/1,663.79
  6. Step 6: Final answer
    x = 1,033.21

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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.