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Finding the Fourth Proportional to 971.47, 1,340.85 and 578.80

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Solution

The fourth proportional to 971.47, 1,340.85 and 578.80 is: 798.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    971.47 : 1,340.85 = 578.80 : x
  2. Step 2: Convert to fraction form
    971.47/1,340.85 = 578.80/x
  3. Step 3: Cross multiply
    971.47x = 1,340.85 × 578.80
  4. Step 4: Simplify right side
    971.47x = 776,083.98
  5. Step 5: Solve for x
    x = 776,083.98/971.47
  6. Step 6: Final answer
    x = 798.88

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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.