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Finding the Fourth Proportional to 138,330.40, 190,893.44 and 77,900.80

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Solution

The fourth proportional to 138,330.40, 190,893.44 and 77,900.80 is: 107,501.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,330.40 : 190,893.44 = 77,900.80 : x
  2. Step 2: Convert to fraction form
    138,330.40/190,893.44 = 77,900.80/x
  3. Step 3: Cross multiply
    138,330.40x = 190,893.44 × 77,900.80
  4. Step 4: Simplify right side
    138,330.40x = 14,870,751,690.75
  5. Step 5: Solve for x
    x = 14,870,751,690.75/138,330.40
  6. Step 6: Final answer
    x = 107,501.69

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1.5x scale

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.