Home / 15,487.30-21,370.64-9,115.84

Finding the Fourth Proportional to 15,487.30, 21,370.64 and 9,115.84

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Solution

The fourth proportional to 15,487.30, 21,370.64 and 9,115.84 is: 12,578.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,487.30 : 21,370.64 = 9,115.84 : x
  2. Step 2: Convert to fraction form
    15,487.30/21,370.64 = 9,115.84/x
  3. Step 3: Cross multiply
    15,487.30x = 21,370.64 × 9,115.84
  4. Step 4: Simplify right side
    15,487.30x = 194,811,316.07
  5. Step 5: Solve for x
    x = 194,811,316.07/15,487.30
  6. Step 6: Final answer
    x = 12,578.78

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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.