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Finding the Fourth Proportional to 708.50, 977.72 and 393.75

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Solution

The fourth proportional to 708.50, 977.72 and 393.75 is: 543.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    708.50 : 977.72 = 393.75 : x
  2. Step 2: Convert to fraction form
    708.50/977.72 = 393.75/x
  3. Step 3: Cross multiply
    708.50x = 977.72 × 393.75
  4. Step 4: Simplify right side
    708.50x = 384,980.42
  5. Step 5: Solve for x
    x = 384,980.42/708.50
  6. Step 6: Final answer
    x = 543.38

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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.