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Finding the Fourth Proportional to 212,616.60, 318,809.70 and 87,970.20

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Solution

The fourth proportional to 212,616.60, 318,809.70 and 87,970.20 is: 131,907.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    212,616.60 : 318,809.70 = 87,970.20 : x
  2. Step 2: Convert to fraction form
    212,616.60/318,809.70 = 87,970.20/x
  3. Step 3: Cross multiply
    212,616.60x = 318,809.70 × 87,970.20
  4. Step 4: Simplify right side
    212,616.60x = 28,045,753,070.94
  5. Step 5: Solve for x
    x = 28,045,753,070.94/212,616.60
  6. Step 6: Final answer
    x = 131,907.64

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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.