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Finding the Fourth Proportional to 212,618.72, 318,967.32 and 87,969.44

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Solution

The fourth proportional to 212,618.72, 318,967.32 and 87,969.44 is: 131,970.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    212,618.72 : 318,967.32 = 87,969.44 : x
  2. Step 2: Convert to fraction form
    212,618.72/318,967.32 = 87,969.44/x
  3. Step 3: Cross multiply
    212,618.72x = 318,967.32 × 87,969.44
  4. Step 4: Simplify right side
    212,618.72x = 28,059,376,518.70
  5. Step 5: Solve for x
    x = 28,059,376,518.70/212,618.72
  6. Step 6: Final answer
    x = 131,970.40

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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.