Home / 128,988.06-177,993.76-72,388.50

Finding the Fourth Proportional to 128,988.06, 177,993.76 and 72,388.50

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Solution

The fourth proportional to 128,988.06, 177,993.76 and 72,388.50 is: 99,890.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,988.06 : 177,993.76 = 72,388.50 : x
  2. Step 2: Convert to fraction form
    128,988.06/177,993.76 = 72,388.50/x
  3. Step 3: Cross multiply
    128,988.06x = 177,993.76 × 72,388.50
  4. Step 4: Simplify right side
    128,988.06x = 12,884,701,114.79
  5. Step 5: Solve for x
    x = 12,884,701,114.79/128,988.06
  6. Step 6: Final answer
    x = 99,890.65

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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.