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Finding the Fourth Proportional to 1,105.84, 1,525.89 and 640

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Solution

The fourth proportional to 1,105.84, 1,525.89 and 640 is: 883.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,105.84 : 1,525.89 = 640 : x
  2. Step 2: Convert to fraction form
    1,105.84/1,525.89 = 640/x
  3. Step 3: Cross multiply
    1,105.84x = 1,525.89 × 640
  4. Step 4: Simplify right side
    1,105.84x = 976,569.60
  5. Step 5: Solve for x
    x = 976,569.60/1,105.84
  6. Step 6: Final answer
    x = 883.10

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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.