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Finding the Fourth Proportional to 1,605.56, 2,215.78 and 897.63

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Solution

The fourth proportional to 1,605.56, 2,215.78 and 897.63 is: 1,238.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,605.56 : 2,215.78 = 897.63 : x
  2. Step 2: Convert to fraction form
    1,605.56/2,215.78 = 897.63/x
  3. Step 3: Cross multiply
    1,605.56x = 2,215.78 × 897.63
  4. Step 4: Simplify right side
    1,605.56x = 1,988,950.60
  5. Step 5: Solve for x
    x = 1,988,950.60/1,605.56
  6. Step 6: Final answer
    x = 1,238.79

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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.