Home / 128,397.06-177,196.14-71,808.84

Finding the Fourth Proportional to 128,397.06, 177,196.14 and 71,808.84

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Solution

The fourth proportional to 128,397.06, 177,196.14 and 71,808.84 is: 99,100.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,397.06 : 177,196.14 = 71,808.84 : x
  2. Step 2: Convert to fraction form
    128,397.06/177,196.14 = 71,808.84/x
  3. Step 3: Cross multiply
    128,397.06x = 177,196.14 × 71,808.84
  4. Step 4: Simplify right side
    128,397.06x = 12,724,249,265.88
  5. Step 5: Solve for x
    x = 12,724,249,265.88/128,397.06
  6. Step 6: Final answer
    x = 99,100.78

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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.