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Finding the Fourth Proportional to 100,970.80, 151,456.20 and 91,129.30

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Solution

The fourth proportional to 100,970.80, 151,456.20 and 91,129.30 is: 136,693.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,970.80 : 151,456.20 = 91,129.30 : x
  2. Step 2: Convert to fraction form
    100,970.80/151,456.20 = 91,129.30/x
  3. Step 3: Cross multiply
    100,970.80x = 151,456.20 × 91,129.30
  4. Step 4: Simplify right side
    100,970.80x = 13,802,097,486.66
  5. Step 5: Solve for x
    x = 13,802,097,486.66/100,970.80
  6. Step 6: Final answer
    x = 136,693.95

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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.