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Finding the Fourth Proportional to 700.80, 1,051.11 and 213.90

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Solution

The fourth proportional to 700.80, 1,051.11 and 213.90 is: 320.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    700.80 : 1,051.11 = 213.90 : x
  2. Step 2: Convert to fraction form
    700.80/1,051.11 = 213.90/x
  3. Step 3: Cross multiply
    700.80x = 1,051.11 × 213.90
  4. Step 4: Simplify right side
    700.80x = 224,832.43
  5. Step 5: Solve for x
    x = 224,832.43/700.80
  6. Step 6: Final answer
    x = 320.82

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.