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Finding the Fourth Proportional to 279,438.66, 384,771.40 and 210,628.10

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Solution

The fourth proportional to 279,438.66, 384,771.40 and 210,628.10 is: 290,023.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    279,438.66 : 384,771.40 = 210,628.10 : x
  2. Step 2: Convert to fraction form
    279,438.66/384,771.40 = 210,628.10/x
  3. Step 3: Cross multiply
    279,438.66x = 384,771.40 × 210,628.10
  4. Step 4: Simplify right side
    279,438.66x = 81,043,668,916.34
  5. Step 5: Solve for x
    x = 81,043,668,916.34/279,438.66
  6. Step 6: Final answer
    x = 290,023.11

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.