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Finding the Fourth Proportional to 698.08, 1,047.54 and 643

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Solution

The fourth proportional to 698.08, 1,047.54 and 643 is: 964.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    698.08 : 1,047.54 = 643 : x
  2. Step 2: Convert to fraction form
    698.08/1,047.54 = 643/x
  3. Step 3: Cross multiply
    698.08x = 1,047.54 × 643
  4. Step 4: Simplify right side
    698.08x = 673,568.22
  5. Step 5: Solve for x
    x = 673,568.22/698.08
  6. Step 6: Final answer
    x = 964.89

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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.