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Finding the Fourth Proportional to 402,878, 555,983.88 and 221,580.56

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Solution

The fourth proportional to 402,878, 555,983.88 and 221,580.56 is: 305,787.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    402,878 : 555,983.88 = 221,580.56 : x
  2. Step 2: Convert to fraction form
    402,878/555,983.88 = 221,580.56/x
  3. Step 3: Cross multiply
    402,878x = 555,983.88 × 221,580.56
  4. Step 4: Simplify right side
    402,878x = 123,195,219,481.37
  5. Step 5: Solve for x
    x = 123,195,219,481.37/402,878
  6. Step 6: Final answer
    x = 305,787.90

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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.