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Finding the Fourth Proportional to 1,188.08, 1,639.60 and 656.99

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Solution

The fourth proportional to 1,188.08, 1,639.60 and 656.99 is: 906.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,188.08 : 1,639.60 = 656.99 : x
  2. Step 2: Convert to fraction form
    1,188.08/1,639.60 = 656.99/x
  3. Step 3: Cross multiply
    1,188.08x = 1,639.60 × 656.99
  4. Step 4: Simplify right side
    1,188.08x = 1,077,203.26
  5. Step 5: Solve for x
    x = 1,077,203.26/1,188.08
  6. Step 6: Final answer
    x = 906.67

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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.