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Finding the Fourth Proportional to 128,808.99, 177,722.78 and 74,347.83

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Solution

The fourth proportional to 128,808.99, 177,722.78 and 74,347.83 is: 102,580.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,808.99 : 177,722.78 = 74,347.83 : x
  2. Step 2: Convert to fraction form
    128,808.99/177,722.78 = 74,347.83/x
  3. Step 3: Cross multiply
    128,808.99x = 177,722.78 × 74,347.83
  4. Step 4: Simplify right side
    128,808.99x = 13,213,302,662.83
  5. Step 5: Solve for x
    x = 13,213,302,662.83/128,808.99
  6. Step 6: Final answer
    x = 102,580.59

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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.