Home / 128,919.77-177,905.85-71,558.91

Finding the Fourth Proportional to 128,919.77, 177,905.85 and 71,558.91

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Solution

The fourth proportional to 128,919.77, 177,905.85 and 71,558.91 is: 98,749.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,919.77 : 177,905.85 = 71,558.91 : x
  2. Step 2: Convert to fraction form
    128,919.77/177,905.85 = 71,558.91/x
  3. Step 3: Cross multiply
    128,919.77x = 177,905.85 × 71,558.91
  4. Step 4: Simplify right side
    128,919.77x = 12,730,748,708.62
  5. Step 5: Solve for x
    x = 12,730,748,708.62/128,919.77
  6. Step 6: Final answer
    x = 98,749.39

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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.