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Finding the Fourth Proportional to 1,117.86, 1,676.81 and 387.46

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Solution

The fourth proportional to 1,117.86, 1,676.81 and 387.46 is: 581.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,117.86 : 1,676.81 = 387.46 : x
  2. Step 2: Convert to fraction form
    1,117.86/1,676.81 = 387.46/x
  3. Step 3: Cross multiply
    1,117.86x = 1,676.81 × 387.46
  4. Step 4: Simplify right side
    1,117.86x = 649,691.64
  5. Step 5: Solve for x
    x = 649,691.64/1,117.86
  6. Step 6: Final answer
    x = 581.19

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