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Finding the Fourth Proportional to 85,671,798.60, 128,507,697.90 and 81,939,901.80

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Solution

The fourth proportional to 85,671,798.60, 128,507,697.90 and 81,939,901.80 is: 122,909,852.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,671,798.60 : 128,507,697.90 = 81,939,901.80 : x
  2. Step 2: Convert to fraction form
    85,671,798.60/128,507,697.90 = 81,939,901.80/x
  3. Step 3: Cross multiply
    85,671,798.60x = 128,507,697.90 × 81,939,901.80
  4. Step 4: Simplify right side
    85,671,798.60x = 10,529,908,146,470,066
  5. Step 5: Solve for x
    x = 10,529,908,146,470,066/85,671,798.60
  6. Step 6: Final answer
    x = 122,909,852.70

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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.