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Finding the Fourth Proportional to 128,393.21, 177,206.95 and 86,025.35

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Solution

The fourth proportional to 128,393.21, 177,206.95 and 86,025.35 is: 118,731.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,393.21 : 177,206.95 = 86,025.35 : x
  2. Step 2: Convert to fraction form
    128,393.21/177,206.95 = 86,025.35/x
  3. Step 3: Cross multiply
    128,393.21x = 177,206.95 × 86,025.35
  4. Step 4: Simplify right side
    128,393.21x = 15,244,288,580.02
  5. Step 5: Solve for x
    x = 15,244,288,580.02/128,393.21
  6. Step 6: Final answer
    x = 118,731.27

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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.