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Finding the Fourth Proportional to 693.90, 957.52 and 399.10

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Solution

The fourth proportional to 693.90, 957.52 and 399.10 is: 550.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    693.90 : 957.52 = 399.10 : x
  2. Step 2: Convert to fraction form
    693.90/957.52 = 399.10/x
  3. Step 3: Cross multiply
    693.90x = 957.52 × 399.10
  4. Step 4: Simplify right side
    693.90x = 382,146.23
  5. Step 5: Solve for x
    x = 382,146.23/693.90
  6. Step 6: Final answer
    x = 550.72

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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.