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Finding the Fourth Proportional to 128,432.64, 177,220.80 and 74,735.04

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Solution

The fourth proportional to 128,432.64, 177,220.80 and 74,735.04 is: 103,124.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,432.64 : 177,220.80 = 74,735.04 : x
  2. Step 2: Convert to fraction form
    128,432.64/177,220.80 = 74,735.04/x
  3. Step 3: Cross multiply
    128,432.64x = 177,220.80 × 74,735.04
  4. Step 4: Simplify right side
    128,432.64x = 13,244,603,576.83
  5. Step 5: Solve for x
    x = 13,244,603,576.83/128,432.64
  6. Step 6: Final answer
    x = 103,124.90

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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.