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Finding the Fourth Proportional to 390,302.70, 585,055.27 and 221,466.37

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Solution

The fourth proportional to 390,302.70, 585,055.27 and 221,466.37 is: 331,973.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,302.70 : 585,055.27 = 221,466.37 : x
  2. Step 2: Convert to fraction form
    390,302.70/585,055.27 = 221,466.37/x
  3. Step 3: Cross multiply
    390,302.70x = 585,055.27 × 221,466.37
  4. Step 4: Simplify right side
    390,302.70x = 129,570,063,417.33
  5. Step 5: Solve for x
    x = 129,570,063,417.33/390,302.70
  6. Step 6: Final answer
    x = 331,973.27

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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.