Home / 128,736.23-177,646.20-72,136.67

Finding the Fourth Proportional to 128,736.23, 177,646.20 and 72,136.67

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Solution

The fourth proportional to 128,736.23, 177,646.20 and 72,136.67 is: 99,543.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,736.23 : 177,646.20 = 72,136.67 : x
  2. Step 2: Convert to fraction form
    128,736.23/177,646.20 = 72,136.67/x
  3. Step 3: Cross multiply
    128,736.23x = 177,646.20 × 72,136.67
  4. Step 4: Simplify right side
    128,736.23x = 12,814,805,306.15
  5. Step 5: Solve for x
    x = 12,814,805,306.15/128,736.23
  6. Step 6: Final answer
    x = 99,543.11

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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.