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Finding the Fourth Proportional to 700.50, 966.70 and 390

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Solution

The fourth proportional to 700.50, 966.70 and 390 is: 538.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    700.50 : 966.70 = 390 : x
  2. Step 2: Convert to fraction form
    700.50/966.70 = 390/x
  3. Step 3: Cross multiply
    700.50x = 966.70 × 390
  4. Step 4: Simplify right side
    700.50x = 377,013
  5. Step 5: Solve for x
    x = 377,013/700.50
  6. Step 6: Final answer
    x = 538.21

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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.