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Finding the Fourth Proportional to 128,503.64, 177,319.37 and 71,138.63

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Solution

The fourth proportional to 128,503.64, 177,319.37 and 71,138.63 is: 98,162.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,503.64 : 177,319.37 = 71,138.63 : x
  2. Step 2: Convert to fraction form
    128,503.64/177,319.37 = 71,138.63/x
  3. Step 3: Cross multiply
    128,503.64x = 177,319.37 × 71,138.63
  4. Step 4: Simplify right side
    128,503.64x = 12,614,256,698.57
  5. Step 5: Solve for x
    x = 12,614,256,698.57/128,503.64
  6. Step 6: Final answer
    x = 98,162.64

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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.