Home / 13,985.32-20,972.50-5,215.45

Finding the Fourth Proportional to 13,985.32, 20,972.50 and 5,215.45

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Solution

The fourth proportional to 13,985.32, 20,972.50 and 5,215.45 is: 7,821.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,985.32 : 20,972.50 = 5,215.45 : x
  2. Step 2: Convert to fraction form
    13,985.32/20,972.50 = 5,215.45/x
  3. Step 3: Cross multiply
    13,985.32x = 20,972.50 × 5,215.45
  4. Step 4: Simplify right side
    13,985.32x = 109,381,025.13
  5. Step 5: Solve for x
    x = 109,381,025.13/13,985.32
  6. Step 6: Final answer
    x = 7,821.13

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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.