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Finding the Fourth Proportional to 709.80, 978.60 and 513.36

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Solution

The fourth proportional to 709.80, 978.60 and 513.36 is: 707.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    709.80 : 978.60 = 513.36 : x
  2. Step 2: Convert to fraction form
    709.80/978.60 = 513.36/x
  3. Step 3: Cross multiply
    709.80x = 978.60 × 513.36
  4. Step 4: Simplify right side
    709.80x = 502,374.10
  5. Step 5: Solve for x
    x = 502,374.10/709.80
  6. Step 6: Final answer
    x = 707.77

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