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Finding the Fourth Proportional to 718,489.76, 991,539.80 and 391,820.64

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Solution

The fourth proportional to 718,489.76, 991,539.80 and 391,820.64 is: 540,725.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    718,489.76 : 991,539.80 = 391,820.64 : x
  2. Step 2: Convert to fraction form
    718,489.76/991,539.80 = 391,820.64/x
  3. Step 3: Cross multiply
    718,489.76x = 991,539.80 × 391,820.64
  4. Step 4: Simplify right side
    718,489.76x = 388,505,760,001.02
  5. Step 5: Solve for x
    x = 388,505,760,001.02/718,489.76
  6. Step 6: Final answer
    x = 540,725.54

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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.