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Finding the Fourth Proportional to 660,658.98, 990,975 and 211,379.78

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Solution

The fourth proportional to 660,658.98, 990,975 and 211,379.78 is: 317,065.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    660,658.98 : 990,975 = 211,379.78 : x
  2. Step 2: Convert to fraction form
    660,658.98/990,975 = 211,379.78/x
  3. Step 3: Cross multiply
    660,658.98x = 990,975 × 211,379.78
  4. Step 4: Simplify right side
    660,658.98x = 209,472,077,485.50
  5. Step 5: Solve for x
    x = 209,472,077,485.50/660,658.98
  6. Step 6: Final answer
    x = 317,065.36

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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.