Home / 20,390.90-28,139.46-11,898.86

Finding the Fourth Proportional to 20,390.90, 28,139.46 and 11,898.86

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Solution

The fourth proportional to 20,390.90, 28,139.46 and 11,898.86 is: 16,420.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,390.90 : 28,139.46 = 11,898.86 : x
  2. Step 2: Convert to fraction form
    20,390.90/28,139.46 = 11,898.86/x
  3. Step 3: Cross multiply
    20,390.90x = 28,139.46 × 11,898.86
  4. Step 4: Simplify right side
    20,390.90x = 334,827,495.02
  5. Step 5: Solve for x
    x = 334,827,495.02/20,390.90
  6. Step 6: Final answer
    x = 16,420.44

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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.