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Finding the Fourth Proportional to 698.81, 1,047.53 and 638.66

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Solution

The fourth proportional to 698.81, 1,047.53 and 638.66 is: 957.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    698.81 : 1,047.53 = 638.66 : x
  2. Step 2: Convert to fraction form
    698.81/1,047.53 = 638.66/x
  3. Step 3: Cross multiply
    698.81x = 1,047.53 × 638.66
  4. Step 4: Simplify right side
    698.81x = 669,019.73
  5. Step 5: Solve for x
    x = 669,019.73/698.81
  6. Step 6: Final answer
    x = 957.38

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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.