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Finding the Fourth Proportional to 718,489.45, 991,539.37 and 391,820.33

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Solution

The fourth proportional to 718,489.45, 991,539.37 and 391,820.33 is: 540,725.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    718,489.45 : 991,539.37 = 391,820.33 : x
  2. Step 2: Convert to fraction form
    718,489.45/991,539.37 = 391,820.33/x
  3. Step 3: Cross multiply
    718,489.45x = 991,539.37 × 391,820.33
  4. Step 4: Simplify right side
    718,489.45x = 388,505,280,552.61
  5. Step 5: Solve for x
    x = 388,505,280,552.61/718,489.45
  6. Step 6: Final answer
    x = 540,725.10

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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.