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Finding the Fourth Proportional to 1,106.25, 1,526.91 and 640.77

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Solution

The fourth proportional to 1,106.25, 1,526.91 and 640.77 is: 884.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,106.25 : 1,526.91 = 640.77 : x
  2. Step 2: Convert to fraction form
    1,106.25/1,526.91 = 640.77/x
  3. Step 3: Cross multiply
    1,106.25x = 1,526.91 × 640.77
  4. Step 4: Simplify right side
    1,106.25x = 978,398.12
  5. Step 5: Solve for x
    x = 978,398.12/1,106.25
  6. Step 6: Final answer
    x = 884.43

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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.