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Finding the Fourth Proportional to 698.11, 1,047.57 and 390.22

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Solution

The fourth proportional to 698.11, 1,047.57 and 390.22 is: 585.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    698.11 : 1,047.57 = 390.22 : x
  2. Step 2: Convert to fraction form
    698.11/1,047.57 = 390.22/x
  3. Step 3: Cross multiply
    698.11x = 1,047.57 × 390.22
  4. Step 4: Simplify right side
    698.11x = 408,782.77
  5. Step 5: Solve for x
    x = 408,782.77/698.11
  6. Step 6: Final answer
    x = 585.56

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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.