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Finding the Fourth Proportional to 1,188, 1,640 and 716.16

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Solution

The fourth proportional to 1,188, 1,640 and 716.16 is: 988.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,188 : 1,640 = 716.16 : x
  2. Step 2: Convert to fraction form
    1,188/1,640 = 716.16/x
  3. Step 3: Cross multiply
    1,188x = 1,640 × 716.16
  4. Step 4: Simplify right side
    1,188x = 1,174,502.40
  5. Step 5: Solve for x
    x = 1,174,502.40/1,188
  6. Step 6: Final answer
    x = 988.64

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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.