Home / 20,987.12-31,485.48-7,136.24

Finding the Fourth Proportional to 20,987.12, 31,485.48 and 7,136.24

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Solution

The fourth proportional to 20,987.12, 31,485.48 and 7,136.24 is: 10,705.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,987.12 : 31,485.48 = 7,136.24 : x
  2. Step 2: Convert to fraction form
    20,987.12/31,485.48 = 7,136.24/x
  3. Step 3: Cross multiply
    20,987.12x = 31,485.48 × 7,136.24
  4. Step 4: Simplify right side
    20,987.12x = 224,687,941.80
  5. Step 5: Solve for x
    x = 224,687,941.80/20,987.12
  6. Step 6: Final answer
    x = 10,705.99

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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.