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Finding the Fourth Proportional to 708,784, 978,121.92 and 390,832

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Solution

The fourth proportional to 708,784, 978,121.92 and 390,832 is: 539,348.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    708,784 : 978,121.92 = 390,832 : x
  2. Step 2: Convert to fraction form
    708,784/978,121.92 = 390,832/x
  3. Step 3: Cross multiply
    708,784x = 978,121.92 × 390,832
  4. Step 4: Simplify right side
    708,784x = 382,281,346,237.44
  5. Step 5: Solve for x
    x = 382,281,346,237.44/708,784
  6. Step 6: Final answer
    x = 539,348.16

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Why These Related Problems?

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