Home / 51,990.20-77,985.30-20,847.80

Finding the Fourth Proportional to 51,990.20, 77,985.30 and 20,847.80

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Solution

The fourth proportional to 51,990.20, 77,985.30 and 20,847.80 is: 31,271.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    51,990.20 : 77,985.30 = 20,847.80 : x
  2. Step 2: Convert to fraction form
    51,990.20/77,985.30 = 20,847.80/x
  3. Step 3: Cross multiply
    51,990.20x = 77,985.30 × 20,847.80
  4. Step 4: Simplify right side
    51,990.20x = 1,625,821,937.34
  5. Step 5: Solve for x
    x = 1,625,821,937.34/51,990.20
  6. Step 6: Final answer
    x = 31,271.70

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Double scale
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Similar ratio
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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.