Home / 491,533,489.31-678,477,865.68-391,245,886.15

Finding the Fourth Proportional to 491,533,489.31, 678,477,865.68 and 391,245,886.15

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Solution

The fourth proportional to 491,533,489.31, 678,477,865.68 and 391,245,886.15 is: 540,047,991.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    491,533,489.31 : 678,477,865.68 = 391,245,886.15 : x
  2. Step 2: Convert to fraction form
    491,533,489.31/678,477,865.68 = 391,245,886.15/x
  3. Step 3: Cross multiply
    491,533,489.31x = 678,477,865.68 × 391,245,886.15
  4. Step 4: Simplify right side
    491,533,489.31x = 265,451,673,787,739,840
  5. Step 5: Solve for x
    x = 265,451,673,787,739,840/491,533,489.31
  6. Step 6: Final answer
    x = 540,047,991.77

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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.