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Finding the Fourth Proportional to 371,927.80, 513,392 and 221,023

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Solution

The fourth proportional to 371,927.80, 513,392 and 221,023 is: 305,089.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    371,927.80 : 513,392 = 221,023 : x
  2. Step 2: Convert to fraction form
    371,927.80/513,392 = 221,023/x
  3. Step 3: Cross multiply
    371,927.80x = 513,392 × 221,023
  4. Step 4: Simplify right side
    371,927.80x = 113,471,440,016
  5. Step 5: Solve for x
    x = 113,471,440,016/371,927.80
  6. Step 6: Final answer
    x = 305,089.97

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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.