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Finding the Fourth Proportional to 700.80, 967.12 and 390.30

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Solution

The fourth proportional to 700.80, 967.12 and 390.30 is: 538.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    700.80 : 967.12 = 390.30 : x
  2. Step 2: Convert to fraction form
    700.80/967.12 = 390.30/x
  3. Step 3: Cross multiply
    700.80x = 967.12 × 390.30
  4. Step 4: Simplify right side
    700.80x = 377,466.94
  5. Step 5: Solve for x
    x = 377,466.94/700.80
  6. Step 6: Final answer
    x = 538.62

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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.