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Finding the Fourth Proportional to 390,303.70, 585,056.72 and 221,467.37

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Solution

The fourth proportional to 390,303.70, 585,056.72 and 221,467.37 is: 331,974.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,303.70 : 585,056.72 = 221,467.37 : x
  2. Step 2: Convert to fraction form
    390,303.70/585,056.72 = 221,467.37/x
  3. Step 3: Cross multiply
    390,303.70x = 585,056.72 × 221,467.37
  4. Step 4: Simplify right side
    390,303.70x = 129,570,970,707.61
  5. Step 5: Solve for x
    x = 129,570,970,707.61/390,303.70
  6. Step 6: Final answer
    x = 331,974.75

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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.