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Finding the Fourth Proportional to 138,028, 190,400.88 and 90,270.40

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Solution

The fourth proportional to 138,028, 190,400.88 and 90,270.40 is: 124,522.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,028 : 190,400.88 = 90,270.40 : x
  2. Step 2: Convert to fraction form
    138,028/190,400.88 = 90,270.40/x
  3. Step 3: Cross multiply
    138,028x = 190,400.88 × 90,270.40
  4. Step 4: Simplify right side
    138,028x = 17,187,563,597.95
  5. Step 5: Solve for x
    x = 17,187,563,597.95/138,028
  6. Step 6: Final answer
    x = 124,522.30

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.