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Finding the Fourth Proportional to 402,968.36, 556,078.76 and 221,668.79

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Solution

The fourth proportional to 402,968.36, 556,078.76 and 221,668.79 is: 305,893.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    402,968.36 : 556,078.76 = 221,668.79 : x
  2. Step 2: Convert to fraction form
    402,968.36/556,078.76 = 221,668.79/x
  3. Step 3: Cross multiply
    402,968.36x = 556,078.76 × 221,668.79
  4. Step 4: Simplify right side
    402,968.36x = 123,265,303,647.68
  5. Step 5: Solve for x
    x = 123,265,303,647.68/402,968.36
  6. Step 6: Final answer
    x = 305,893.26

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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.