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Finding the Fourth Proportional to 638,978.21, 881,775.73 and 352,498.22

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Solution

The fourth proportional to 638,978.21, 881,775.73 and 352,498.22 is: 486,439.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    638,978.21 : 881,775.73 = 352,498.22 : x
  2. Step 2: Convert to fraction form
    638,978.21/881,775.73 = 352,498.22/x
  3. Step 3: Cross multiply
    638,978.21x = 881,775.73 × 352,498.22
  4. Step 4: Simplify right side
    638,978.21x = 310,824,376,587.39
  5. Step 5: Solve for x
    x = 310,824,376,587.39/638,978.21
  6. Step 6: Final answer
    x = 486,439.71

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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.