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Finding the Fourth Proportional to 140,310,878.74, 210,467,978.86 and 84,990,777.07

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Solution

The fourth proportional to 140,310,878.74, 210,467,978.86 and 84,990,777.07 is: 127,487,171.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    140,310,878.74 : 210,467,978.86 = 84,990,777.07 : x
  2. Step 2: Convert to fraction form
    140,310,878.74/210,467,978.86 = 84,990,777.07/x
  3. Step 3: Cross multiply
    140,310,878.74x = 210,467,978.86 × 84,990,777.07
  4. Step 4: Simplify right side
    140,310,878.74x = 17,887,837,071,479,496
  5. Step 5: Solve for x
    x = 17,887,837,071,479,496/140,310,878.74
  6. Step 6: Final answer
    x = 127,487,171.58

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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.