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Finding the Fourth Proportional to 390,313.72, 585,071.74 and 221,477.37

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Solution

The fourth proportional to 390,313.72, 585,071.74 and 221,477.37 is: 331,989.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,313.72 : 585,071.74 = 221,477.37 : x
  2. Step 2: Convert to fraction form
    390,313.72/585,071.74 = 221,477.37/x
  3. Step 3: Cross multiply
    390,313.72x = 585,071.74 × 221,477.37
  4. Step 4: Simplify right side
    390,313.72x = 129,580,150,236.52
  5. Step 5: Solve for x
    x = 129,580,150,236.52/390,313.72
  6. Step 6: Final answer
    x = 331,989.74

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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.