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Finding the Fourth Proportional to 708,695,919.21, 978,003,072.23 and 395,443,336.17

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Solution

The fourth proportional to 708,695,919.21, 978,003,072.23 and 395,443,336.17 is: 545,713,312.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    708,695,919.21 : 978,003,072.23 = 395,443,336.17 : x
  2. Step 2: Convert to fraction form
    708,695,919.21/978,003,072.23 = 395,443,336.17/x
  3. Step 3: Cross multiply
    708,695,919.21x = 978,003,072.23 × 395,443,336.17
  4. Step 4: Simplify right side
    708,695,919.21x = 386,744,797,665,163,520
  5. Step 5: Solve for x
    x = 386,744,797,665,163,520/708,695,919.21
  6. Step 6: Final answer
    x = 545,713,312.55

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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.