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Finding the Fourth Proportional to 212,978.40, 318,949.20 and 212,978.40

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Solution

The fourth proportional to 212,978.40, 318,949.20 and 212,978.40 is: 318,949.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    212,978.40 : 318,949.20 = 212,978.40 : x
  2. Step 2: Convert to fraction form
    212,978.40/318,949.20 = 212,978.40/x
  3. Step 3: Cross multiply
    212,978.40x = 318,949.20 × 212,978.40
  4. Step 4: Simplify right side
    212,978.40x = 67,929,290,297.28
  5. Step 5: Solve for x
    x = 67,929,290,297.28/212,978.40
  6. Step 6: Final answer
    x = 318,949.20

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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.