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Finding the Fourth Proportional to 128,660.40, 177,438.60 and 86,216.40

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Solution

The fourth proportional to 128,660.40, 177,438.60 and 86,216.40 is: 118,903.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,660.40 : 177,438.60 = 86,216.40 : x
  2. Step 2: Convert to fraction form
    128,660.40/177,438.60 = 86,216.40/x
  3. Step 3: Cross multiply
    128,660.40x = 177,438.60 × 86,216.40
  4. Step 4: Simplify right side
    128,660.40x = 15,298,117,313.04
  5. Step 5: Solve for x
    x = 15,298,117,313.04/128,660.40
  6. Step 6: Final answer
    x = 118,903.08

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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.