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Finding the Fourth Proportional to 699.22, 1,051.26 and 645.76

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Solution

The fourth proportional to 699.22, 1,051.26 and 645.76 is: 970.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    699.22 : 1,051.26 = 645.76 : x
  2. Step 2: Convert to fraction form
    699.22/1,051.26 = 645.76/x
  3. Step 3: Cross multiply
    699.22x = 1,051.26 × 645.76
  4. Step 4: Simplify right side
    699.22x = 678,861.66
  5. Step 5: Solve for x
    x = 678,861.66/699.22
  6. Step 6: Final answer
    x = 970.88

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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.