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Finding the Fourth Proportional to 431.95, 647.91 and 143.38

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Solution

The fourth proportional to 431.95, 647.91 and 143.38 is: 215.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    431.95 : 647.91 = 143.38 : x
  2. Step 2: Convert to fraction form
    431.95/647.91 = 143.38/x
  3. Step 3: Cross multiply
    431.95x = 647.91 × 143.38
  4. Step 4: Simplify right side
    431.95x = 92,897.34
  5. Step 5: Solve for x
    x = 92,897.34/431.95
  6. Step 6: Final answer
    x = 215.07

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