Home / 128,928.78-177,923.27-71,569.23

Finding the Fourth Proportional to 128,928.78, 177,923.27 and 71,569.23

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Solution

The fourth proportional to 128,928.78, 177,923.27 and 71,569.23 is: 98,766.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,928.78 : 177,923.27 = 71,569.23 : x
  2. Step 2: Convert to fraction form
    128,928.78/177,923.27 = 71,569.23/x
  3. Step 3: Cross multiply
    128,928.78x = 177,923.27 × 71,569.23
  4. Step 4: Simplify right side
    128,928.78x = 12,733,831,075.14
  5. Step 5: Solve for x
    x = 12,733,831,075.14/128,928.78
  6. Step 6: Final answer
    x = 98,766.40

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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.