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Finding the Fourth Proportional to 639,912.50, 883,003.71 and 353,415.50

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Solution

The fourth proportional to 639,912.50, 883,003.71 and 353,415.50 is: 487,671.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    639,912.50 : 883,003.71 = 353,415.50 : x
  2. Step 2: Convert to fraction form
    639,912.50/883,003.71 = 353,415.50/x
  3. Step 3: Cross multiply
    639,912.50x = 883,003.71 × 353,415.50
  4. Step 4: Simplify right side
    639,912.50x = 312,067,197,671.51
  5. Step 5: Solve for x
    x = 312,067,197,671.51/639,912.50
  6. Step 6: Final answer
    x = 487,671.67

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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.