Home / 20,768.40-31,152.60-12,457.80

Finding the Fourth Proportional to 20,768.40, 31,152.60 and 12,457.80

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Solution

The fourth proportional to 20,768.40, 31,152.60 and 12,457.80 is: 18,686.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,768.40 : 31,152.60 = 12,457.80 : x
  2. Step 2: Convert to fraction form
    20,768.40/31,152.60 = 12,457.80/x
  3. Step 3: Cross multiply
    20,768.40x = 31,152.60 × 12,457.80
  4. Step 4: Simplify right side
    20,768.40x = 388,092,860.28
  5. Step 5: Solve for x
    x = 388,092,860.28/20,768.40
  6. Step 6: Final answer
    x = 18,686.70

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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.