Home / 8,421.40-11,621.49-4,644.46

Finding the Fourth Proportional to 8,421.40, 11,621.49 and 4,644.46

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Solution

The fourth proportional to 8,421.40, 11,621.49 and 4,644.46 is: 6,409.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,421.40 : 11,621.49 = 4,644.46 : x
  2. Step 2: Convert to fraction form
    8,421.40/11,621.49 = 4,644.46/x
  3. Step 3: Cross multiply
    8,421.40x = 11,621.49 × 4,644.46
  4. Step 4: Simplify right side
    8,421.40x = 53,975,545.45
  5. Step 5: Solve for x
    x = 53,975,545.45/8,421.40
  6. Step 6: Final answer
    x = 6,409.33

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.