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Finding the Fourth Proportional to 509.76, 703.26 and 354.60

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Solution

The fourth proportional to 509.76, 703.26 and 354.60 is: 489.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    509.76 : 703.26 = 354.60 : x
  2. Step 2: Convert to fraction form
    509.76/703.26 = 354.60/x
  3. Step 3: Cross multiply
    509.76x = 703.26 × 354.60
  4. Step 4: Simplify right side
    509.76x = 249,376.00
  5. Step 5: Solve for x
    x = 249,376.00/509.76
  6. Step 6: Final answer
    x = 489.20

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