Home / 20,279.52-27,988.56-11,898.72

Finding the Fourth Proportional to 20,279.52, 27,988.56 and 11,898.72

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Solution

The fourth proportional to 20,279.52, 27,988.56 and 11,898.72 is: 16,421.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,279.52 : 27,988.56 = 11,898.72 : x
  2. Step 2: Convert to fraction form
    20,279.52/27,988.56 = 11,898.72/x
  3. Step 3: Cross multiply
    20,279.52x = 27,988.56 × 11,898.72
  4. Step 4: Simplify right side
    20,279.52x = 333,028,038.64
  5. Step 5: Solve for x
    x = 333,028,038.64/20,279.52
  6. Step 6: Final answer
    x = 16,421.89

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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.