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Finding the Fourth Proportional to 708,903,619.67, 978,217,067.95 and 391,343,244.41

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Solution

The fourth proportional to 708,903,619.67, 978,217,067.95 and 391,343,244.41 is: 540,015,074.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    708,903,619.67 : 978,217,067.95 = 391,343,244.41 : x
  2. Step 2: Convert to fraction form
    708,903,619.67/978,217,067.95 = 391,343,244.41/x
  3. Step 3: Cross multiply
    708,903,619.67x = 978,217,067.95 × 391,343,244.41
  4. Step 4: Simplify right side
    708,903,619.67x = 382,818,641,108,790,464
  5. Step 5: Solve for x
    x = 382,818,641,108,790,464/708,903,619.67
  6. Step 6: Final answer
    x = 540,015,074.67

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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.