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Finding the Fourth Proportional to 1,270.09, 1,754.08 and 1,220.89

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Solution

The fourth proportional to 1,270.09, 1,754.08 and 1,220.89 is: 1,686.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,270.09 : 1,754.08 = 1,220.89 : x
  2. Step 2: Convert to fraction form
    1,270.09/1,754.08 = 1,220.89/x
  3. Step 3: Cross multiply
    1,270.09x = 1,754.08 × 1,220.89
  4. Step 4: Simplify right side
    1,270.09x = 2,141,538.73
  5. Step 5: Solve for x
    x = 2,141,538.73/1,270.09
  6. Step 6: Final answer
    x = 1,686.13

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.