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Finding the Fourth Proportional to 99,856,181.60, 149,784,272.40 and 81,716,328.80

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Solution

The fourth proportional to 99,856,181.60, 149,784,272.40 and 81,716,328.80 is: 122,574,493.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    99,856,181.60 : 149,784,272.40 = 81,716,328.80 : x
  2. Step 2: Convert to fraction form
    99,856,181.60/149,784,272.40 = 81,716,328.80/x
  3. Step 3: Cross multiply
    99,856,181.60x = 149,784,272.40 × 81,716,328.80
  4. Step 4: Simplify right side
    99,856,181.60x = 12,239,820,852,507,166
  5. Step 5: Solve for x
    x = 12,239,820,852,507,166/99,856,181.60
  6. Step 6: Final answer
    x = 122,574,493.20

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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.