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Finding the Fourth Proportional to 75,326,978.40, 112,990,467.60 and 70,792,015.20

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Solution

The fourth proportional to 75,326,978.40, 112,990,467.60 and 70,792,015.20 is: 106,188,022.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    75,326,978.40 : 112,990,467.60 = 70,792,015.20 : x
  2. Step 2: Convert to fraction form
    75,326,978.40/112,990,467.60 = 70,792,015.20/x
  3. Step 3: Cross multiply
    75,326,978.40x = 112,990,467.60 × 70,792,015.20
  4. Step 4: Simplify right side
    75,326,978.40x = 7,998,822,899,794,307
  5. Step 5: Solve for x
    x = 7,998,822,899,794,307/75,326,978.40
  6. Step 6: Final answer
    x = 106,188,022.80

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.