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Finding the Fourth Proportional to 128,737.23, 177,647.58 and 72,137.67

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Solution

The fourth proportional to 128,737.23, 177,647.58 and 72,137.67 is: 99,544.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,737.23 : 177,647.58 = 72,137.67 : x
  2. Step 2: Convert to fraction form
    128,737.23/177,647.58 = 72,137.67/x
  3. Step 3: Cross multiply
    128,737.23x = 177,647.58 × 72,137.67
  4. Step 4: Simplify right side
    128,737.23x = 12,815,082,502.34
  5. Step 5: Solve for x
    x = 12,815,082,502.34/128,737.23
  6. Step 6: Final answer
    x = 99,544.49

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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.