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Finding the Fourth Proportional to 128,904.64, 177,894.88 and 80,535.68

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Solution

The fourth proportional to 128,904.64, 177,894.88 and 80,535.68 is: 111,143.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,904.64 : 177,894.88 = 80,535.68 : x
  2. Step 2: Convert to fraction form
    128,904.64/177,894.88 = 80,535.68/x
  3. Step 3: Cross multiply
    128,904.64x = 177,894.88 × 80,535.68
  4. Step 4: Simplify right side
    128,904.64x = 14,326,885,129.32
  5. Step 5: Solve for x
    x = 14,326,885,129.32/128,904.64
  6. Step 6: Final answer
    x = 111,143.28

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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.