Home / 128,340.90-177,104.61-70,980.75

Finding the Fourth Proportional to 128,340.90, 177,104.61 and 70,980.75

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Solution

The fourth proportional to 128,340.90, 177,104.61 and 70,980.75 is: 97,950.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,340.90 : 177,104.61 = 70,980.75 : x
  2. Step 2: Convert to fraction form
    128,340.90/177,104.61 = 70,980.75/x
  3. Step 3: Cross multiply
    128,340.90x = 177,104.61 × 70,980.75
  4. Step 4: Simplify right side
    128,340.90x = 12,571,018,046.26
  5. Step 5: Solve for x
    x = 12,571,018,046.26/128,340.90
  6. Step 6: Final answer
    x = 97,950.21

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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.