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Finding the Fourth Proportional to 128,622.94, 177,505.12 and 74,899.28

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Solution

The fourth proportional to 128,622.94, 177,505.12 and 74,899.28 is: 103,364.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,622.94 : 177,505.12 = 74,899.28 : x
  2. Step 2: Convert to fraction form
    128,622.94/177,505.12 = 74,899.28/x
  3. Step 3: Cross multiply
    128,622.94x = 177,505.12 × 74,899.28
  4. Step 4: Simplify right side
    128,622.94x = 13,295,006,221.70
  5. Step 5: Solve for x
    x = 13,295,006,221.70/128,622.94
  6. Step 6: Final answer
    x = 103,364.19

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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.