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Finding the Fourth Proportional to 1,188.95, 1,640.88 and 657.88

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Solution

The fourth proportional to 1,188.95, 1,640.88 and 657.88 is: 907.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,188.95 : 1,640.88 = 657.88 : x
  2. Step 2: Convert to fraction form
    1,188.95/1,640.88 = 657.88/x
  3. Step 3: Cross multiply
    1,188.95x = 1,640.88 × 657.88
  4. Step 4: Simplify right side
    1,188.95x = 1,079,504.50
  5. Step 5: Solve for x
    x = 1,079,504.50/1,188.95
  6. Step 6: Final answer
    x = 907.95

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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.