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Finding the Fourth Proportional to 136,998, 205,558.56 and 87,065.15

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Solution

The fourth proportional to 136,998, 205,558.56 and 87,065.15 is: 130,636.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    136,998 : 205,558.56 = 87,065.15 : x
  2. Step 2: Convert to fraction form
    136,998/205,558.56 = 87,065.15/x
  3. Step 3: Cross multiply
    136,998x = 205,558.56 × 87,065.15
  4. Step 4: Simplify right side
    136,998x = 17,896,985,832.39
  5. Step 5: Solve for x
    x = 17,896,985,832.39/136,998
  6. Step 6: Final answer
    x = 130,636.84

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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.