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Finding the Fourth Proportional to 1,357.24, 1,871.04 and 890.68

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Solution

The fourth proportional to 1,357.24, 1,871.04 and 890.68 is: 1,227.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,357.24 : 1,871.04 = 890.68 : x
  2. Step 2: Convert to fraction form
    1,357.24/1,871.04 = 890.68/x
  3. Step 3: Cross multiply
    1,357.24x = 1,871.04 × 890.68
  4. Step 4: Simplify right side
    1,357.24x = 1,666,497.91
  5. Step 5: Solve for x
    x = 1,666,497.91/1,357.24
  6. Step 6: Final answer
    x = 1,227.86

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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.