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Finding the Third Proportional to 87,421,860 and 128,298,438

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Solution

The third proportional to 87,421,860 and 128,298,438 is: 188,288,023.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    87,421,860 : 128,298,438 = 128,298,438 : x
  2. Step 2: Convert to fraction form
    87,421,860/128,298,438 = 128,298,438/x
  3. Step 3: Cross multiply
    87,421,860x = 128,298,438 × 128,298,438
  4. Step 4: Simplify right side
    87,421,860x = 16,460,489,193,239,844
  5. Step 5: Solve for x
    x = 16,460,489,193,239,844/87,421,860
  6. Step 6: Final answer
    x = 188,288,023.08

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Why These Related Problems?

These problems maintain the same ratio (1.47) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.