Home / 128,897.20-177,941.64-81,223.84

Finding the Fourth Proportional to 128,897.20, 177,941.64 and 81,223.84

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Solution

The fourth proportional to 128,897.20, 177,941.64 and 81,223.84 is: 112,128.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,897.20 : 177,941.64 = 81,223.84 : x
  2. Step 2: Convert to fraction form
    128,897.20/177,941.64 = 81,223.84/x
  3. Step 3: Cross multiply
    128,897.20x = 177,941.64 × 81,223.84
  4. Step 4: Simplify right side
    128,897.20x = 14,453,103,296.70
  5. Step 5: Solve for x
    x = 14,453,103,296.70/128,897.20
  6. Step 6: Final answer
    x = 112,128.92

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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.