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Finding the Fourth Proportional to 690.91, 1,036.80 and 280.05

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Solution

The fourth proportional to 690.91, 1,036.80 and 280.05 is: 420.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    690.91 : 1,036.80 = 280.05 : x
  2. Step 2: Convert to fraction form
    690.91/1,036.80 = 280.05/x
  3. Step 3: Cross multiply
    690.91x = 1,036.80 × 280.05
  4. Step 4: Simplify right side
    690.91x = 290,354.87
  5. Step 5: Solve for x
    x = 290,354.87/690.91
  6. Step 6: Final answer
    x = 420.25

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