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Finding the Fourth Proportional to 971.73, 1,340.89 and 578.68

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Solution

The fourth proportional to 971.73, 1,340.89 and 578.68 is: 798.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    971.73 : 1,340.89 = 578.68 : x
  2. Step 2: Convert to fraction form
    971.73/1,340.89 = 578.68/x
  3. Step 3: Cross multiply
    971.73x = 1,340.89 × 578.68
  4. Step 4: Simplify right side
    971.73x = 775,941.43
  5. Step 5: Solve for x
    x = 775,941.43/971.73
  6. Step 6: Final answer
    x = 798.52

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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.