Home / 20,284.20-28,013.58-15,521.40

Finding the Fourth Proportional to 20,284.20, 28,013.58 and 15,521.40

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Solution

The fourth proportional to 20,284.20, 28,013.58 and 15,521.40 is: 21,435.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,284.20 : 28,013.58 = 15,521.40 : x
  2. Step 2: Convert to fraction form
    20,284.20/28,013.58 = 15,521.40/x
  3. Step 3: Cross multiply
    20,284.20x = 28,013.58 × 15,521.40
  4. Step 4: Simplify right side
    20,284.20x = 434,809,980.61
  5. Step 5: Solve for x
    x = 434,809,980.61/20,284.20
  6. Step 6: Final answer
    x = 21,435.89

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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.