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Finding the Fourth Proportional to 1,188.34, 1,639.89 and 657.21

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Solution

The fourth proportional to 1,188.34, 1,639.89 and 657.21 is: 906.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,188.34 : 1,639.89 = 657.21 : x
  2. Step 2: Convert to fraction form
    1,188.34/1,639.89 = 657.21/x
  3. Step 3: Cross multiply
    1,188.34x = 1,639.89 × 657.21
  4. Step 4: Simplify right side
    1,188.34x = 1,077,752.11
  5. Step 5: Solve for x
    x = 1,077,752.11/1,188.34
  6. Step 6: Final answer
    x = 906.94

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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.