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Finding the Fourth Proportional to 212,901.57, 318,990.83 and 128,484.34

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Solution

The fourth proportional to 212,901.57, 318,990.83 and 128,484.34 is: 192,508.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    212,901.57 : 318,990.83 = 128,484.34 : x
  2. Step 2: Convert to fraction form
    212,901.57/318,990.83 = 128,484.34/x
  3. Step 3: Cross multiply
    212,901.57x = 318,990.83 × 128,484.34
  4. Step 4: Simplify right side
    212,901.57x = 40,985,324,818.70
  5. Step 5: Solve for x
    x = 40,985,324,818.70/212,901.57
  6. Step 6: Final answer
    x = 192,508.33

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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.