Home / 13,985.57-20,972.88-5,215.70

Finding the Fourth Proportional to 13,985.57, 20,972.88 and 5,215.70

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Solution

The fourth proportional to 13,985.57, 20,972.88 and 5,215.70 is: 7,821.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,985.57 : 20,972.88 = 5,215.70 : x
  2. Step 2: Convert to fraction form
    13,985.57/20,972.88 = 5,215.70/x
  3. Step 3: Cross multiply
    13,985.57x = 20,972.88 × 5,215.70
  4. Step 4: Simplify right side
    13,985.57x = 109,388,145.35
  5. Step 5: Solve for x
    x = 109,388,145.35/13,985.57
  6. Step 6: Final answer
    x = 7,821.50

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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.