Home / 20,718.76-31,077.88-5,136.24

Finding the Fourth Proportional to 20,718.76, 31,077.88 and 5,136.24

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Solution

The fourth proportional to 20,718.76, 31,077.88 and 5,136.24 is: 7,704.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,718.76 : 31,077.88 = 5,136.24 : x
  2. Step 2: Convert to fraction form
    20,718.76/31,077.88 = 5,136.24/x
  3. Step 3: Cross multiply
    20,718.76x = 31,077.88 × 5,136.24
  4. Step 4: Simplify right side
    20,718.76x = 159,623,450.37
  5. Step 5: Solve for x
    x = 159,623,450.37/20,718.76
  6. Step 6: Final answer
    x = 7,704.30

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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.