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Finding the Fourth Proportional to 1,270.80, 1,905.12 and 693.12

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Solution

The fourth proportional to 1,270.80, 1,905.12 and 693.12 is: 1,039.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,270.80 : 1,905.12 = 693.12 : x
  2. Step 2: Convert to fraction form
    1,270.80/1,905.12 = 693.12/x
  3. Step 3: Cross multiply
    1,270.80x = 1,905.12 × 693.12
  4. Step 4: Simplify right side
    1,270.80x = 1,320,476.77
  5. Step 5: Solve for x
    x = 1,320,476.77/1,270.80
  6. Step 6: Final answer
    x = 1,039.09

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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.