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Finding the Fourth Proportional to 402,805.60, 555,886 and 221,531.54

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Solution

The fourth proportional to 402,805.60, 555,886 and 221,531.54 is: 305,721.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    402,805.60 : 555,886 = 221,531.54 : x
  2. Step 2: Convert to fraction form
    402,805.60/555,886 = 221,531.54/x
  3. Step 3: Cross multiply
    402,805.60x = 555,886 × 221,531.54
  4. Step 4: Simplify right side
    402,805.60x = 123,146,281,644.44
  5. Step 5: Solve for x
    x = 123,146,281,644.44/402,805.60
  6. Step 6: Final answer
    x = 305,721.37

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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.