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Finding the Fourth Proportional to 977.85, 1,348.62 and 712.31

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Solution

The fourth proportional to 977.85, 1,348.62 and 712.31 is: 982.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    977.85 : 1,348.62 = 712.31 : x
  2. Step 2: Convert to fraction form
    977.85/1,348.62 = 712.31/x
  3. Step 3: Cross multiply
    977.85x = 1,348.62 × 712.31
  4. Step 4: Simplify right side
    977.85x = 960,628.77
  5. Step 5: Solve for x
    x = 960,628.77/977.85
  6. Step 6: Final answer
    x = 982.39

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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.