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Finding the Fourth Proportional to 212,708.06, 318,641.80 and 128,218.80

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Solution

The fourth proportional to 212,708.06, 318,641.80 and 128,218.80 is: 192,074.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    212,708.06 : 318,641.80 = 128,218.80 : x
  2. Step 2: Convert to fraction form
    212,708.06/318,641.80 = 128,218.80/x
  3. Step 3: Cross multiply
    212,708.06x = 318,641.80 × 128,218.80
  4. Step 4: Simplify right side
    212,708.06x = 40,855,869,225.84
  5. Step 5: Solve for x
    x = 40,855,869,225.84/212,708.06
  6. Step 6: Final answer
    x = 192,074.85

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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.