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Finding the Fourth Proportional to 128,638.95, 177,527.24 and 74,915.29

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Solution

The fourth proportional to 128,638.95, 177,527.24 and 74,915.29 is: 103,386.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,638.95 : 177,527.24 = 74,915.29 : x
  2. Step 2: Convert to fraction form
    128,638.95/177,527.24 = 74,915.29/x
  3. Step 3: Cross multiply
    128,638.95x = 177,527.24 × 74,915.29
  4. Step 4: Simplify right side
    128,638.95x = 13,299,504,667.50
  5. Step 5: Solve for x
    x = 13,299,504,667.50/128,638.95
  6. Step 6: Final answer
    x = 103,386.30

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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.