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Finding the Fourth Proportional to 8,918.76, 12,309.30 and 6,790.86

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Solution

The fourth proportional to 8,918.76, 12,309.30 and 6,790.86 is: 9,372.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,918.76 : 12,309.30 = 6,790.86 : x
  2. Step 2: Convert to fraction form
    8,918.76/12,309.30 = 6,790.86/x
  3. Step 3: Cross multiply
    8,918.76x = 12,309.30 × 6,790.86
  4. Step 4: Simplify right side
    8,918.76x = 83,590,733.00
  5. Step 5: Solve for x
    x = 83,590,733.00/8,918.76
  6. Step 6: Final answer
    x = 9,372.46

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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.