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Finding the Fourth Proportional to 628,109.40, 866,421.63 and 395,165.82

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Solution

The fourth proportional to 628,109.40, 866,421.63 and 395,165.82 is: 545,096.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    628,109.40 : 866,421.63 = 395,165.82 : x
  2. Step 2: Convert to fraction form
    628,109.40/866,421.63 = 395,165.82/x
  3. Step 3: Cross multiply
    628,109.40x = 866,421.63 × 395,165.82
  4. Step 4: Simplify right side
    628,109.40x = 342,380,213,884.69
  5. Step 5: Solve for x
    x = 342,380,213,884.69/628,109.40
  6. Step 6: Final answer
    x = 545,096.47

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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.