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Finding the Fourth Proportional to 285,904.70, 428,857.05 and 128,440.70

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Solution

The fourth proportional to 285,904.70, 428,857.05 and 128,440.70 is: 192,661.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    285,904.70 : 428,857.05 = 128,440.70 : x
  2. Step 2: Convert to fraction form
    285,904.70/428,857.05 = 128,440.70/x
  3. Step 3: Cross multiply
    285,904.70x = 428,857.05 × 128,440.70
  4. Step 4: Simplify right side
    285,904.70x = 55,082,699,701.94
  5. Step 5: Solve for x
    x = 55,082,699,701.94/285,904.70
  6. Step 6: Final answer
    x = 192,661.05

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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.