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Finding the Fourth Proportional to 128,998,374.60, 181,107,907.80 and 128,998,374.60

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Solution

The fourth proportional to 128,998,374.60, 181,107,907.80 and 128,998,374.60 is: 181,107,907.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,998,374.60 : 181,107,907.80 = 128,998,374.60 : x
  2. Step 2: Convert to fraction form
    128,998,374.60/181,107,907.80 = 128,998,374.60/x
  3. Step 3: Cross multiply
    128,998,374.60x = 181,107,907.80 × 128,998,374.60
  4. Step 4: Simplify right side
    128,998,374.60x = 23,362,625,733,406,664
  5. Step 5: Solve for x
    x = 23,362,625,733,406,664/128,998,374.60
  6. Step 6: Final answer
    x = 181,107,907.80

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Why These Related Problems?

These problems maintain the same ratio (1.40) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.