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Finding the Fourth Proportional to 128,898.68, 177,868.23 and 72,299.12

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Solution

The fourth proportional to 128,898.68, 177,868.23 and 72,299.12 is: 99,766.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,898.68 : 177,868.23 = 72,299.12 : x
  2. Step 2: Convert to fraction form
    128,898.68/177,868.23 = 72,299.12/x
  3. Step 3: Cross multiply
    128,898.68x = 177,868.23 × 72,299.12
  4. Step 4: Simplify right side
    128,898.68x = 12,859,716,504.96
  5. Step 5: Solve for x
    x = 12,859,716,504.96/128,898.68
  6. Step 6: Final answer
    x = 99,766.08

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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.