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Finding the Fourth Proportional to 698.63, 1,047.06 and 611.75

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Solution

The fourth proportional to 698.63, 1,047.06 and 611.75 is: 916.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    698.63 : 1,047.06 = 611.75 : x
  2. Step 2: Convert to fraction form
    698.63/1,047.06 = 611.75/x
  3. Step 3: Cross multiply
    698.63x = 1,047.06 × 611.75
  4. Step 4: Simplify right side
    698.63x = 640,533.72
  5. Step 5: Solve for x
    x = 640,533.72/698.63
  6. Step 6: Final answer
    x = 916.85

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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.