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Finding the Fourth Proportional to 213,198.80, 319,798.20 and 211,643.60

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Solution

The fourth proportional to 213,198.80, 319,798.20 and 211,643.60 is: 317,465.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    213,198.80 : 319,798.20 = 211,643.60 : x
  2. Step 2: Convert to fraction form
    213,198.80/319,798.20 = 211,643.60/x
  3. Step 3: Cross multiply
    213,198.80x = 319,798.20 × 211,643.60
  4. Step 4: Simplify right side
    213,198.80x = 67,683,242,321.52
  5. Step 5: Solve for x
    x = 67,683,242,321.52/213,198.80
  6. Step 6: Final answer
    x = 317,465.40

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1.5x scale

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.