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Finding the Fourth Proportional to 1,318.56, 1,820.45 and 821.92

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Solution

The fourth proportional to 1,318.56, 1,820.45 and 821.92 is: 1,134.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,318.56 : 1,820.45 = 821.92 : x
  2. Step 2: Convert to fraction form
    1,318.56/1,820.45 = 821.92/x
  3. Step 3: Cross multiply
    1,318.56x = 1,820.45 × 821.92
  4. Step 4: Simplify right side
    1,318.56x = 1,496,264.26
  5. Step 5: Solve for x
    x = 1,496,264.26/1,318.56
  6. Step 6: Final answer
    x = 1,134.77

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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.