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Finding the Fourth Proportional to 976.86, 1,465.28 and 391.70

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Solution

The fourth proportional to 976.86, 1,465.28 and 391.70 is: 587.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    976.86 : 1,465.28 = 391.70 : x
  2. Step 2: Convert to fraction form
    976.86/1,465.28 = 391.70/x
  3. Step 3: Cross multiply
    976.86x = 1,465.28 × 391.70
  4. Step 4: Simplify right side
    976.86x = 573,950.18
  5. Step 5: Solve for x
    x = 573,950.18/976.86
  6. Step 6: Final answer
    x = 587.55

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.