Home / 128,426.40-177,256.08-78,141.60

Finding the Fourth Proportional to 128,426.40, 177,256.08 and 78,141.60

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Solution

The fourth proportional to 128,426.40, 177,256.08 and 78,141.60 is: 107,852.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,426.40 : 177,256.08 = 78,141.60 : x
  2. Step 2: Convert to fraction form
    128,426.40/177,256.08 = 78,141.60/x
  3. Step 3: Cross multiply
    128,426.40x = 177,256.08 × 78,141.60
  4. Step 4: Simplify right side
    128,426.40x = 13,851,073,700.93
  5. Step 5: Solve for x
    x = 13,851,073,700.93/128,426.40
  6. Step 6: Final answer
    x = 107,852.23

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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.