Home / 15,421.31-21,281.38-8,347.76

Finding the Fourth Proportional to 15,421.31, 21,281.38 and 8,347.76

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Solution

The fourth proportional to 15,421.31, 21,281.38 and 8,347.76 is: 11,519.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,421.31 : 21,281.38 = 8,347.76 : x
  2. Step 2: Convert to fraction form
    15,421.31/21,281.38 = 8,347.76/x
  3. Step 3: Cross multiply
    15,421.31x = 21,281.38 × 8,347.76
  4. Step 4: Simplify right side
    15,421.31x = 177,651,725.43
  5. Step 5: Solve for x
    x = 177,651,725.43/15,421.31
  6. Step 6: Final answer
    x = 11,519.89

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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.