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Finding the Fourth Proportional to 128,638.44, 177,526.55 and 74,914.78

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Solution

The fourth proportional to 128,638.44, 177,526.55 and 74,914.78 is: 103,385.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,638.44 : 177,526.55 = 74,914.78 : x
  2. Step 2: Convert to fraction form
    128,638.44/177,526.55 = 74,914.78/x
  3. Step 3: Cross multiply
    128,638.44x = 177,526.55 × 74,914.78
  4. Step 4: Simplify right side
    128,638.44x = 13,299,362,437.41
  5. Step 5: Solve for x
    x = 13,299,362,437.41/128,638.44
  6. Step 6: Final answer
    x = 103,385.60

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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.