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Finding the Fourth Proportional to 1,132.76, 1,698 and 644.80

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Solution

The fourth proportional to 1,132.76, 1,698 and 644.80 is: 966.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,132.76 : 1,698 = 644.80 : x
  2. Step 2: Convert to fraction form
    1,132.76/1,698 = 644.80/x
  3. Step 3: Cross multiply
    1,132.76x = 1,698 × 644.80
  4. Step 4: Simplify right side
    1,132.76x = 1,094,870.40
  5. Step 5: Solve for x
    x = 1,094,870.40/1,132.76
  6. Step 6: Final answer
    x = 966.55

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