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Finding the Fourth Proportional to 1,218.63, 1,681.97 and 776.43

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Solution

The fourth proportional to 1,218.63, 1,681.97 and 776.43 is: 1,071.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,218.63 : 1,681.97 = 776.43 : x
  2. Step 2: Convert to fraction form
    1,218.63/1,681.97 = 776.43/x
  3. Step 3: Cross multiply
    1,218.63x = 1,681.97 × 776.43
  4. Step 4: Simplify right side
    1,218.63x = 1,305,931.97
  5. Step 5: Solve for x
    x = 1,305,931.97/1,218.63
  6. Step 6: Final answer
    x = 1,071.64

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These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.