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Finding the Fourth Proportional to 1,188.63, 1,640.27 and 835.07

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Solution

The fourth proportional to 1,188.63, 1,640.27 and 835.07 is: 1,152.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,188.63 : 1,640.27 = 835.07 : x
  2. Step 2: Convert to fraction form
    1,188.63/1,640.27 = 835.07/x
  3. Step 3: Cross multiply
    1,188.63x = 1,640.27 × 835.07
  4. Step 4: Simplify right side
    1,188.63x = 1,369,727.89
  5. Step 5: Solve for x
    x = 1,369,727.89/1,188.63
  6. Step 6: Final answer
    x = 1,152.36

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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.