Home / 20,315.60-30,478.37-6,988.80

Finding the Fourth Proportional to 20,315.60, 30,478.37 and 6,988.80

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Solution

The fourth proportional to 20,315.60, 30,478.37 and 6,988.80 is: 10,484.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,315.60 : 30,478.37 = 6,988.80 : x
  2. Step 2: Convert to fraction form
    20,315.60/30,478.37 = 6,988.80/x
  3. Step 3: Cross multiply
    20,315.60x = 30,478.37 × 6,988.80
  4. Step 4: Simplify right side
    20,315.60x = 213,007,197.31
  5. Step 5: Solve for x
    x = 213,007,197.31/20,315.60
  6. Step 6: Final answer
    x = 10,484.91

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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.