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Finding the Fourth Proportional to 1,136.79, 1,568.93 and 639.51

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Solution

The fourth proportional to 1,136.79, 1,568.93 and 639.51 is: 882.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,136.79 : 1,568.93 = 639.51 : x
  2. Step 2: Convert to fraction form
    1,136.79/1,568.93 = 639.51/x
  3. Step 3: Cross multiply
    1,136.79x = 1,568.93 × 639.51
  4. Step 4: Simplify right side
    1,136.79x = 1,003,343.23
  5. Step 5: Solve for x
    x = 1,003,343.23/1,136.79
  6. Step 6: Final answer
    x = 882.61

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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.