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Finding the Fourth Proportional to 128,998,421.10, 181,107,972.90 and 128,998,421.10

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Solution

The fourth proportional to 128,998,421.10, 181,107,972.90 and 128,998,421.10 is: 181,107,972.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,998,421.10 : 181,107,972.90 = 128,998,421.10 : x
  2. Step 2: Convert to fraction form
    128,998,421.10/181,107,972.90 = 128,998,421.10/x
  3. Step 3: Cross multiply
    128,998,421.10x = 181,107,972.90 × 128,998,421.10
  4. Step 4: Simplify right side
    128,998,421.10x = 23,362,642,552,721,588
  5. Step 5: Solve for x
    x = 23,362,642,552,721,588/128,998,421.10
  6. Step 6: Final answer
    x = 181,107,972.90

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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.