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Finding the Fourth Proportional to 285,903.70, 428,855.55 and 128,439.70

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Solution

The fourth proportional to 285,903.70, 428,855.55 and 128,439.70 is: 192,659.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    285,903.70 : 428,855.55 = 128,439.70 : x
  2. Step 2: Convert to fraction form
    285,903.70/428,855.55 = 128,439.70/x
  3. Step 3: Cross multiply
    285,903.70x = 428,855.55 × 128,439.70
  4. Step 4: Simplify right side
    285,903.70x = 55,082,078,185.34
  5. Step 5: Solve for x
    x = 55,082,078,185.34/285,903.70
  6. Step 6: Final answer
    x = 192,659.55

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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.