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Finding the Fourth Proportional to 1,188.35, 1,639.94 and 657.26

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Solution

The fourth proportional to 1,188.35, 1,639.94 and 657.26 is: 907.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,188.35 : 1,639.94 = 657.26 : x
  2. Step 2: Convert to fraction form
    1,188.35/1,639.94 = 657.26/x
  3. Step 3: Cross multiply
    1,188.35x = 1,639.94 × 657.26
  4. Step 4: Simplify right side
    1,188.35x = 1,077,866.96
  5. Step 5: Solve for x
    x = 1,077,866.96/1,188.35
  6. Step 6: Final answer
    x = 907.03

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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.