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Finding the Fourth Proportional to 20,385, 28,128.87 and 11,888.91

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Solution

The fourth proportional to 20,385, 28,128.87 and 11,888.91 is: 16,405.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,385 : 28,128.87 = 11,888.91 : x
  2. Step 2: Convert to fraction form
    20,385/28,128.87 = 11,888.91/x
  3. Step 3: Cross multiply
    20,385x = 28,128.87 × 11,888.91
  4. Step 4: Simplify right side
    20,385x = 334,421,603.83
  5. Step 5: Solve for x
    x = 334,421,603.83/20,385
  6. Step 6: Final answer
    x = 16,405.28

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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.