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Finding the Fourth Proportional to 212,626.60, 318,939.90 and 142,124.20

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Solution

The fourth proportional to 212,626.60, 318,939.90 and 142,124.20 is: 213,186.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    212,626.60 : 318,939.90 = 142,124.20 : x
  2. Step 2: Convert to fraction form
    212,626.60/318,939.90 = 142,124.20/x
  3. Step 3: Cross multiply
    212,626.60x = 318,939.90 × 142,124.20
  4. Step 4: Simplify right side
    212,626.60x = 45,329,078,135.58
  5. Step 5: Solve for x
    x = 45,329,078,135.58/212,626.60
  6. Step 6: Final answer
    x = 213,186.30

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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.