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Finding the Fourth Proportional to 10,939.80, 16,425.90 and 8,477.40

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Solution

The fourth proportional to 10,939.80, 16,425.90 and 8,477.40 is: 12,728.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    10,939.80 : 16,425.90 = 8,477.40 : x
  2. Step 2: Convert to fraction form
    10,939.80/16,425.90 = 8,477.40/x
  3. Step 3: Cross multiply
    10,939.80x = 16,425.90 × 8,477.40
  4. Step 4: Simplify right side
    10,939.80x = 139,248,924.66
  5. Step 5: Solve for x
    x = 139,248,924.66/10,939.80
  6. Step 6: Final answer
    x = 12,728.65

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1.5x scale

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.