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Finding the Fourth Proportional to 211,020.80, 316,531.20 and 70,745.60

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Solution

The fourth proportional to 211,020.80, 316,531.20 and 70,745.60 is: 106,118.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    211,020.80 : 316,531.20 = 70,745.60 : x
  2. Step 2: Convert to fraction form
    211,020.80/316,531.20 = 70,745.60/x
  3. Step 3: Cross multiply
    211,020.80x = 316,531.20 × 70,745.60
  4. Step 4: Simplify right side
    211,020.80x = 22,393,189,662.72
  5. Step 5: Solve for x
    x = 22,393,189,662.72/211,020.80
  6. Step 6: Final answer
    x = 106,118.40

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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.