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Finding the Fourth Proportional to 402,906.78, 555,999.75 and 221,618.70

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Solution

The fourth proportional to 402,906.78, 555,999.75 and 221,618.70 is: 305,827.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    402,906.78 : 555,999.75 = 221,618.70 : x
  2. Step 2: Convert to fraction form
    402,906.78/555,999.75 = 221,618.70/x
  3. Step 3: Cross multiply
    402,906.78x = 555,999.75 × 221,618.70
  4. Step 4: Simplify right side
    402,906.78x = 123,219,941,795.33
  5. Step 5: Solve for x
    x = 123,219,941,795.33/402,906.78
  6. Step 6: Final answer
    x = 305,827.42

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1.5x scale

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.