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Finding the Fourth Proportional to 212,618.94, 318,817.68 and 79,389.63

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Solution

The fourth proportional to 212,618.94, 318,817.68 and 79,389.63 is: 119,043.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    212,618.94 : 318,817.68 = 79,389.63 : x
  2. Step 2: Convert to fraction form
    212,618.94/318,817.68 = 79,389.63/x
  3. Step 3: Cross multiply
    212,618.94x = 318,817.68 × 79,389.63
  4. Step 4: Simplify right side
    212,618.94x = 25,310,817,652.66
  5. Step 5: Solve for x
    x = 25,310,817,652.66/212,618.94
  6. Step 6: Final answer
    x = 119,043.10

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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.