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Finding the Fourth Proportional to 698.02, 1,047.09 and 210.98

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Solution

The fourth proportional to 698.02, 1,047.09 and 210.98 is: 316.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    698.02 : 1,047.09 = 210.98 : x
  2. Step 2: Convert to fraction form
    698.02/1,047.09 = 210.98/x
  3. Step 3: Cross multiply
    698.02x = 1,047.09 × 210.98
  4. Step 4: Simplify right side
    698.02x = 220,918.46
  5. Step 5: Solve for x
    x = 220,918.46/698.02
  6. Step 6: Final answer
    x = 316.49

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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.