Home / 128,948.16-177,939-71,590.80

Finding the Fourth Proportional to 128,948.16, 177,939 and 71,590.80

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Solution

The fourth proportional to 128,948.16, 177,939 and 71,590.80 is: 98,790.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,948.16 : 177,939 = 71,590.80 : x
  2. Step 2: Convert to fraction form
    128,948.16/177,939 = 71,590.80/x
  3. Step 3: Cross multiply
    128,948.16x = 177,939 × 71,590.80
  4. Step 4: Simplify right side
    128,948.16x = 12,738,795,361.20
  5. Step 5: Solve for x
    x = 12,738,795,361.20/128,948.16
  6. Step 6: Final answer
    x = 98,790.05

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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.