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Finding the Fourth Proportional to 11,239.10, 16,870.80 and 8,784.80

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Solution

The fourth proportional to 11,239.10, 16,870.80 and 8,784.80 is: 13,186.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    11,239.10 : 16,870.80 = 8,784.80 : x
  2. Step 2: Convert to fraction form
    11,239.10/16,870.80 = 8,784.80/x
  3. Step 3: Cross multiply
    11,239.10x = 16,870.80 × 8,784.80
  4. Step 4: Simplify right side
    11,239.10x = 148,206,603.84
  5. Step 5: Solve for x
    x = 148,206,603.84/11,239.10
  6. Step 6: Final answer
    x = 13,186.70

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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.