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Finding the Fourth Proportional to 976.86, 1,347.96 and 578.46

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Solution

The fourth proportional to 976.86, 1,347.96 and 578.46 is: 798.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    976.86 : 1,347.96 = 578.46 : x
  2. Step 2: Convert to fraction form
    976.86/1,347.96 = 578.46/x
  3. Step 3: Cross multiply
    976.86x = 1,347.96 × 578.46
  4. Step 4: Simplify right side
    976.86x = 779,740.94
  5. Step 5: Solve for x
    x = 779,740.94/976.86
  6. Step 6: Final answer
    x = 798.21

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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.