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Finding the Fourth Proportional to 78,612,400.80, 117,918,601.20 and 70,676,215.20

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Solution

The fourth proportional to 78,612,400.80, 117,918,601.20 and 70,676,215.20 is: 106,014,322.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,612,400.80 : 117,918,601.20 = 70,676,215.20 : x
  2. Step 2: Convert to fraction form
    78,612,400.80/117,918,601.20 = 70,676,215.20/x
  3. Step 3: Cross multiply
    78,612,400.80x = 117,918,601.20 × 70,676,215.20
  4. Step 4: Simplify right side
    78,612,400.80x = 8,334,040,434,494,179
  5. Step 5: Solve for x
    x = 8,334,040,434,494,179/78,612,400.80
  6. Step 6: Final answer
    x = 106,014,322.80

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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.