Home / 21,087.74-31,631.60-8,613.64

Finding the Fourth Proportional to 21,087.74, 31,631.60 and 8,613.64

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Solution

The fourth proportional to 21,087.74, 31,631.60 and 8,613.64 is: 12,920.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,087.74 : 31,631.60 = 8,613.64 : x
  2. Step 2: Convert to fraction form
    21,087.74/31,631.60 = 8,613.64/x
  3. Step 3: Cross multiply
    21,087.74x = 31,631.60 × 8,613.64
  4. Step 4: Simplify right side
    21,087.74x = 272,463,215.02
  5. Step 5: Solve for x
    x = 272,463,215.02/21,087.74
  6. Step 6: Final answer
    x = 12,920.46

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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.