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Finding the Fourth Proportional to 128,997,638.10, 181,106,876.70 and 128,997,638.10

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Solution

The fourth proportional to 128,997,638.10, 181,106,876.70 and 128,997,638.10 is: 181,106,876.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,997,638.10 : 181,106,876.70 = 128,997,638.10 : x
  2. Step 2: Convert to fraction form
    128,997,638.10/181,106,876.70 = 128,997,638.10/x
  3. Step 3: Cross multiply
    128,997,638.10x = 181,106,876.70 × 128,997,638.10
  4. Step 4: Simplify right side
    128,997,638.10x = 23,362,359,337,967,920
  5. Step 5: Solve for x
    x = 23,362,359,337,967,920/128,997,638.10
  6. Step 6: Final answer
    x = 181,106,876.70

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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.