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Finding the Fourth Proportional to 971.39, 1,340.55 and 578.54

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Solution

The fourth proportional to 971.39, 1,340.55 and 578.54 is: 798.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    971.39 : 1,340.55 = 578.54 : x
  2. Step 2: Convert to fraction form
    971.39/1,340.55 = 578.54/x
  3. Step 3: Cross multiply
    971.39x = 1,340.55 × 578.54
  4. Step 4: Simplify right side
    971.39x = 775,565.15
  5. Step 5: Solve for x
    x = 775,565.15/971.39
  6. Step 6: Final answer
    x = 798.41

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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.