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Finding the Fourth Proportional to 971.04, 1,339.83 and 578.19

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Solution

The fourth proportional to 971.04, 1,339.83 and 578.19 is: 797.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    971.04 : 1,339.83 = 578.19 : x
  2. Step 2: Convert to fraction form
    971.04/1,339.83 = 578.19/x
  3. Step 3: Cross multiply
    971.04x = 1,339.83 × 578.19
  4. Step 4: Simplify right side
    971.04x = 774,676.31
  5. Step 5: Solve for x
    x = 774,676.31/971.04
  6. Step 6: Final answer
    x = 797.78

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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.