Home / 8,421.40-12,640.20-4,266.10

Finding the Fourth Proportional to 8,421.40, 12,640.20 and 4,266.10

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Solution

The fourth proportional to 8,421.40, 12,640.20 and 4,266.10 is: 6,403.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,421.40 : 12,640.20 = 4,266.10 : x
  2. Step 2: Convert to fraction form
    8,421.40/12,640.20 = 4,266.10/x
  3. Step 3: Cross multiply
    8,421.40x = 12,640.20 × 4,266.10
  4. Step 4: Simplify right side
    8,421.40x = 53,924,357.22
  5. Step 5: Solve for x
    x = 53,924,357.22/8,421.40
  6. Step 6: Final answer
    x = 6,403.25

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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.