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Finding the Fourth Proportional to 212,720.80, 319,340.40 and 211,165.60

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Solution

The fourth proportional to 212,720.80, 319,340.40 and 211,165.60 is: 317,005.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    212,720.80 : 319,340.40 = 211,165.60 : x
  2. Step 2: Convert to fraction form
    212,720.80/319,340.40 = 211,165.60/x
  3. Step 3: Cross multiply
    212,720.80x = 319,340.40 × 211,165.60
  4. Step 4: Simplify right side
    212,720.80x = 67,433,707,170.24
  5. Step 5: Solve for x
    x = 67,433,707,170.24/212,720.80
  6. Step 6: Final answer
    x = 317,005.70

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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.