Home / 20,972.08-31,458.12-5,389.72

Finding the Fourth Proportional to 20,972.08, 31,458.12 and 5,389.72

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Solution

The fourth proportional to 20,972.08, 31,458.12 and 5,389.72 is: 8,084.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,972.08 : 31,458.12 = 5,389.72 : x
  2. Step 2: Convert to fraction form
    20,972.08/31,458.12 = 5,389.72/x
  3. Step 3: Cross multiply
    20,972.08x = 31,458.12 × 5,389.72
  4. Step 4: Simplify right side
    20,972.08x = 169,550,458.53
  5. Step 5: Solve for x
    x = 169,550,458.53/20,972.08
  6. Step 6: Final answer
    x = 8,084.58

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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.