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Finding the Fourth Proportional to 128,648.64, 177,557.04 and 74,965.44

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Solution

The fourth proportional to 128,648.64, 177,557.04 and 74,965.44 is: 103,465.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,648.64 : 177,557.04 = 74,965.44 : x
  2. Step 2: Convert to fraction form
    128,648.64/177,557.04 = 74,965.44/x
  3. Step 3: Cross multiply
    128,648.64x = 177,557.04 × 74,965.44
  4. Step 4: Simplify right side
    128,648.64x = 13,310,641,628.70
  5. Step 5: Solve for x
    x = 13,310,641,628.70/128,648.64
  6. Step 6: Final answer
    x = 103,465.08

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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.