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Finding the Fourth Proportional to 1,981.43, 2,971.95 and 811.47

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Solution

The fourth proportional to 1,981.43, 2,971.95 and 811.47 is: 1,217.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,981.43 : 2,971.95 = 811.47 : x
  2. Step 2: Convert to fraction form
    1,981.43/2,971.95 = 811.47/x
  3. Step 3: Cross multiply
    1,981.43x = 2,971.95 × 811.47
  4. Step 4: Simplify right side
    1,981.43x = 2,411,648.27
  5. Step 5: Solve for x
    x = 2,411,648.27/1,981.43
  6. Step 6: Final answer
    x = 1,217.13

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.