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Finding the Fourth Proportional to 68,984,915.20, 103,477,372.80 and 20,464,518.40

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Solution

The fourth proportional to 68,984,915.20, 103,477,372.80 and 20,464,518.40 is: 30,696,777.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    68,984,915.20 : 103,477,372.80 = 20,464,518.40 : x
  2. Step 2: Convert to fraction form
    68,984,915.20/103,477,372.80 = 20,464,518.40/x
  3. Step 3: Cross multiply
    68,984,915.20x = 103,477,372.80 × 20,464,518.40
  4. Step 4: Simplify right side
    68,984,915.20x = 2,117,614,599,649,259.25
  5. Step 5: Solve for x
    x = 2,117,614,599,649,259.25/68,984,915.20
  6. Step 6: Final answer
    x = 30,696,777.60

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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.