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Finding the Fourth Proportional to 460,912.80, 691,369.20 and 128,488.80

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Solution

The fourth proportional to 460,912.80, 691,369.20 and 128,488.80 is: 192,733.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    460,912.80 : 691,369.20 = 128,488.80 : x
  2. Step 2: Convert to fraction form
    460,912.80/691,369.20 = 128,488.80/x
  3. Step 3: Cross multiply
    460,912.80x = 691,369.20 × 128,488.80
  4. Step 4: Simplify right side
    460,912.80x = 88,833,198,864.96
  5. Step 5: Solve for x
    x = 88,833,198,864.96/460,912.80
  6. Step 6: Final answer
    x = 192,733.20

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.