Home / 8,421.45-11,621.69-4,644.76

Finding the Fourth Proportional to 8,421.45, 11,621.69 and 4,644.76

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Solution

The fourth proportional to 8,421.45, 11,621.69 and 4,644.76 is: 6,409.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,421.45 : 11,621.69 = 4,644.76 : x
  2. Step 2: Convert to fraction form
    8,421.45/11,621.69 = 4,644.76/x
  3. Step 3: Cross multiply
    8,421.45x = 11,621.69 × 4,644.76
  4. Step 4: Simplify right side
    8,421.45x = 53,979,960.84
  5. Step 5: Solve for x
    x = 53,979,960.84/8,421.45
  6. Step 6: Final answer
    x = 6,409.82

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Half scale
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Double scale
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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.