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Finding the Fourth Proportional to 8,976.70, 12,387.71 and 4,997.81

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Solution

The fourth proportional to 8,976.70, 12,387.71 and 4,997.81 is: 6,896.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,976.70 : 12,387.71 = 4,997.81 : x
  2. Step 2: Convert to fraction form
    8,976.70/12,387.71 = 4,997.81/x
  3. Step 3: Cross multiply
    8,976.70x = 12,387.71 × 4,997.81
  4. Step 4: Simplify right side
    8,976.70x = 61,911,420.92
  5. Step 5: Solve for x
    x = 61,911,420.92/8,976.70
  6. Step 6: Final answer
    x = 6,896.90

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1.5x scale

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.