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Finding the Fourth Proportional to 976.35, 1,347.32 and 556.70

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Solution

The fourth proportional to 976.35, 1,347.32 and 556.70 is: 768.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    976.35 : 1,347.32 = 556.70 : x
  2. Step 2: Convert to fraction form
    976.35/1,347.32 = 556.70/x
  3. Step 3: Cross multiply
    976.35x = 1,347.32 × 556.70
  4. Step 4: Simplify right side
    976.35x = 750,043.52
  5. Step 5: Solve for x
    x = 750,043.52/976.35
  6. Step 6: Final answer
    x = 768.21

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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.