Home / 8,421.56-11,621.47-4,644.79

Finding the Fourth Proportional to 8,421.56, 11,621.47 and 4,644.79

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Solution

The fourth proportional to 8,421.56, 11,621.47 and 4,644.79 is: 6,409.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,421.56 : 11,621.47 = 4,644.79 : x
  2. Step 2: Convert to fraction form
    8,421.56/11,621.47 = 4,644.79/x
  3. Step 3: Cross multiply
    8,421.56x = 11,621.47 × 4,644.79
  4. Step 4: Simplify right side
    8,421.56x = 53,979,287.64
  5. Step 5: Solve for x
    x = 53,979,287.64/8,421.56
  6. Step 6: Final answer
    x = 6,409.65

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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.