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Finding the Fourth Proportional to 128,679.08, 177,586.98 and 74,241

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Solution

The fourth proportional to 128,679.08, 177,586.98 and 74,241 is: 102,458.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,679.08 : 177,586.98 = 74,241 : x
  2. Step 2: Convert to fraction form
    128,679.08/177,586.98 = 74,241/x
  3. Step 3: Cross multiply
    128,679.08x = 177,586.98 × 74,241
  4. Step 4: Simplify right side
    128,679.08x = 13,184,234,982.18
  5. Step 5: Solve for x
    x = 13,184,234,982.18/128,679.08
  6. Step 6: Final answer
    x = 102,458.26

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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.