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Finding the Fourth Proportional to 10,866.95, 14,999.96 and 6,390.49

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Solution

The fourth proportional to 10,866.95, 14,999.96 and 6,390.49 is: 8,820.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    10,866.95 : 14,999.96 = 6,390.49 : x
  2. Step 2: Convert to fraction form
    10,866.95/14,999.96 = 6,390.49/x
  3. Step 3: Cross multiply
    10,866.95x = 14,999.96 × 6,390.49
  4. Step 4: Simplify right side
    10,866.95x = 95,856,987.43
  5. Step 5: Solve for x
    x = 95,856,987.43/10,866.95
  6. Step 6: Final answer
    x = 8,820.97

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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.