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Finding the Fourth Proportional to 1,435.66, 1,981.20 and 814.66

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Solution

The fourth proportional to 1,435.66, 1,981.20 and 814.66 is: 1,124.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,435.66 : 1,981.20 = 814.66 : x
  2. Step 2: Convert to fraction form
    1,435.66/1,981.20 = 814.66/x
  3. Step 3: Cross multiply
    1,435.66x = 1,981.20 × 814.66
  4. Step 4: Simplify right side
    1,435.66x = 1,614,004.39
  5. Step 5: Solve for x
    x = 1,614,004.39/1,435.66
  6. Step 6: Final answer
    x = 1,124.22

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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.