Home / 128,706.40-177,282.48-90,915.04

Finding the Fourth Proportional to 128,706.40, 177,282.48 and 90,915.04

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Solution

The fourth proportional to 128,706.40, 177,282.48 and 90,915.04 is: 125,227.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,706.40 : 177,282.48 = 90,915.04 : x
  2. Step 2: Convert to fraction form
    128,706.40/177,282.48 = 90,915.04/x
  3. Step 3: Cross multiply
    128,706.40x = 177,282.48 × 90,915.04
  4. Step 4: Simplify right side
    128,706.40x = 16,117,643,760.50
  5. Step 5: Solve for x
    x = 16,117,643,760.50/128,706.40
  6. Step 6: Final answer
    x = 125,227.99

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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.