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Finding the Fourth Proportional to 138,347,999.90, 207,298,051.05 and 87,138,374.30

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Solution

The fourth proportional to 138,347,999.90, 207,298,051.05 and 87,138,374.30 is: 130,566,507.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,347,999.90 : 207,298,051.05 = 87,138,374.30 : x
  2. Step 2: Convert to fraction form
    138,347,999.90/207,298,051.05 = 87,138,374.30/x
  3. Step 3: Cross multiply
    138,347,999.90x = 207,298,051.05 × 87,138,374.30
  4. Step 4: Simplify right side
    138,347,999.90x = 18,063,615,164,055,408
  5. Step 5: Solve for x
    x = 18,063,615,164,055,408/138,347,999.90
  6. Step 6: Final answer
    x = 130,566,507.48

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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.