Home / 78,631,246.80-117,946,870.20-21,129,330.60

Finding the Fourth Proportional to 78,631,246.80, 117,946,870.20 and 21,129,330.60

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Solution

The fourth proportional to 78,631,246.80, 117,946,870.20 and 21,129,330.60 is: 31,693,995.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,631,246.80 : 117,946,870.20 = 21,129,330.60 : x
  2. Step 2: Convert to fraction form
    78,631,246.80/117,946,870.20 = 21,129,330.60/x
  3. Step 3: Cross multiply
    78,631,246.80x = 117,946,870.20 × 21,129,330.60
  4. Step 4: Simplify right side
    78,631,246.80x = 2,492,138,413,691,088.50
  5. Step 5: Solve for x
    x = 2,492,138,413,691,088.50/78,631,246.80
  6. Step 6: Final answer
    x = 31,693,995.90

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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.