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Finding the Fourth Proportional to 708.72, 978.04 and 393.99

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Solution

The fourth proportional to 708.72, 978.04 and 393.99 is: 543.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    708.72 : 978.04 = 393.99 : x
  2. Step 2: Convert to fraction form
    708.72/978.04 = 393.99/x
  3. Step 3: Cross multiply
    708.72x = 978.04 × 393.99
  4. Step 4: Simplify right side
    708.72x = 385,334.80
  5. Step 5: Solve for x
    x = 385,334.80/708.72
  6. Step 6: Final answer
    x = 543.70

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.