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Finding the Fourth Proportional to 128,638.46, 177,522.96 and 74,922.08

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Solution

The fourth proportional to 128,638.46, 177,522.96 and 74,922.08 is: 103,393.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,638.46 : 177,522.96 = 74,922.08 : x
  2. Step 2: Convert to fraction form
    128,638.46/177,522.96 = 74,922.08/x
  3. Step 3: Cross multiply
    128,638.46x = 177,522.96 × 74,922.08
  4. Step 4: Simplify right side
    128,638.46x = 13,300,389,410.96
  5. Step 5: Solve for x
    x = 13,300,389,410.96/128,638.46
  6. Step 6: Final answer
    x = 103,393.57

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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.