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Finding the Fourth Proportional to 280,760.40, 421,140.60 and 266,936.40

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Solution

The fourth proportional to 280,760.40, 421,140.60 and 266,936.40 is: 400,404.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    280,760.40 : 421,140.60 = 266,936.40 : x
  2. Step 2: Convert to fraction form
    280,760.40/421,140.60 = 266,936.40/x
  3. Step 3: Cross multiply
    280,760.40x = 421,140.60 × 266,936.40
  4. Step 4: Simplify right side
    280,760.40x = 112,417,755,657.84
  5. Step 5: Solve for x
    x = 112,417,755,657.84/280,760.40
  6. Step 6: Final answer
    x = 400,404.60

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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.