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Finding the Fourth Proportional to 10,939.74, 15,070.50 and 8,700.90

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Solution

The fourth proportional to 10,939.74, 15,070.50 and 8,700.90 is: 11,986.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    10,939.74 : 15,070.50 = 8,700.90 : x
  2. Step 2: Convert to fraction form
    10,939.74/15,070.50 = 8,700.90/x
  3. Step 3: Cross multiply
    10,939.74x = 15,070.50 × 8,700.90
  4. Step 4: Simplify right side
    10,939.74x = 131,126,913.45
  5. Step 5: Solve for x
    x = 131,126,913.45/10,939.74
  6. Step 6: Final answer
    x = 11,986.29

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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.