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Finding the Fourth Proportional to 280,605.80, 420,908.70 and 280,605.80

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Solution

The fourth proportional to 280,605.80, 420,908.70 and 280,605.80 is: 420,908.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    280,605.80 : 420,908.70 = 280,605.80 : x
  2. Step 2: Convert to fraction form
    280,605.80/420,908.70 = 280,605.80/x
  3. Step 3: Cross multiply
    280,605.80x = 420,908.70 × 280,605.80
  4. Step 4: Simplify right side
    280,605.80x = 118,109,422,490.46
  5. Step 5: Solve for x
    x = 118,109,422,490.46/280,605.80
  6. Step 6: Final answer
    x = 420,908.70

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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.