Home / 20,485.65-30,740.40-8,638.68

Finding the Fourth Proportional to 20,485.65, 30,740.40 and 8,638.68

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Solution

The fourth proportional to 20,485.65, 30,740.40 and 8,638.68 is: 12,963.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,485.65 : 30,740.40 = 8,638.68 : x
  2. Step 2: Convert to fraction form
    20,485.65/30,740.40 = 8,638.68/x
  3. Step 3: Cross multiply
    20,485.65x = 30,740.40 × 8,638.68
  4. Step 4: Simplify right side
    20,485.65x = 265,556,478.67
  5. Step 5: Solve for x
    x = 265,556,478.67/20,485.65
  6. Step 6: Final answer
    x = 12,963.05

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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.