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Finding the Fourth Proportional to 390,294.70, 585,043.27 and 221,458.37

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Solution

The fourth proportional to 390,294.70, 585,043.27 and 221,458.37 is: 331,961.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,294.70 : 585,043.27 = 221,458.37 : x
  2. Step 2: Convert to fraction form
    390,294.70/585,043.27 = 221,458.37/x
  3. Step 3: Cross multiply
    390,294.70x = 585,043.27 × 221,458.37
  4. Step 4: Simplify right side
    390,294.70x = 129,562,725,474.81
  5. Step 5: Solve for x
    x = 129,562,725,474.81/390,294.70
  6. Step 6: Final answer
    x = 331,961.28

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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.