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Finding the Fourth Proportional to 128,777.65, 177,705.89 and 75,071.41

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Solution

The fourth proportional to 128,777.65, 177,705.89 and 75,071.41 is: 103,594.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,777.65 : 177,705.89 = 75,071.41 : x
  2. Step 2: Convert to fraction form
    128,777.65/177,705.89 = 75,071.41/x
  3. Step 3: Cross multiply
    128,777.65x = 177,705.89 × 75,071.41
  4. Step 4: Simplify right side
    128,777.65x = 13,340,631,727.60
  5. Step 5: Solve for x
    x = 13,340,631,727.60/128,777.65
  6. Step 6: Final answer
    x = 103,594.31

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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.