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Finding the Fourth Proportional to 647.22, 970.83 and 455.70

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Solution

The fourth proportional to 647.22, 970.83 and 455.70 is: 683.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    647.22 : 970.83 = 455.70 : x
  2. Step 2: Convert to fraction form
    647.22/970.83 = 455.70/x
  3. Step 3: Cross multiply
    647.22x = 970.83 × 455.70
  4. Step 4: Simplify right side
    647.22x = 442,407.23
  5. Step 5: Solve for x
    x = 442,407.23/647.22
  6. Step 6: Final answer
    x = 683.55

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