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Finding the Fourth Proportional to 1,345.66, 1,857.09 and 821.86

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Solution

The fourth proportional to 1,345.66, 1,857.09 and 821.86 is: 1,134.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,345.66 : 1,857.09 = 821.86 : x
  2. Step 2: Convert to fraction form
    1,345.66/1,857.09 = 821.86/x
  3. Step 3: Cross multiply
    1,345.66x = 1,857.09 × 821.86
  4. Step 4: Simplify right side
    1,345.66x = 1,526,267.99
  5. Step 5: Solve for x
    x = 1,526,267.99/1,345.66
  6. Step 6: Final answer
    x = 1,134.22

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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.