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Finding the Fourth Proportional to 15,588.88, 21,512.65 and 8,515.31

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Solution

The fourth proportional to 15,588.88, 21,512.65 and 8,515.31 is: 11,751.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,588.88 : 21,512.65 = 8,515.31 : x
  2. Step 2: Convert to fraction form
    15,588.88/21,512.65 = 8,515.31/x
  3. Step 3: Cross multiply
    15,588.88x = 21,512.65 × 8,515.31
  4. Step 4: Simplify right side
    15,588.88x = 183,186,883.67
  5. Step 5: Solve for x
    x = 183,186,883.67/15,588.88
  6. Step 6: Final answer
    x = 11,751.13

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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.