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Finding the Fourth Proportional to 128,383.14, 177,165.42 and 71,020.98

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Solution

The fourth proportional to 128,383.14, 177,165.42 and 71,020.98 is: 98,007.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,383.14 : 177,165.42 = 71,020.98 : x
  2. Step 2: Convert to fraction form
    128,383.14/177,165.42 = 71,020.98/x
  3. Step 3: Cross multiply
    128,383.14x = 177,165.42 × 71,020.98
  4. Step 4: Simplify right side
    128,383.14x = 12,582,461,750.51
  5. Step 5: Solve for x
    x = 12,582,461,750.51/128,383.14
  6. Step 6: Final answer
    x = 98,007.12

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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.