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Finding the Fourth Proportional to 15,710.88, 21,680.82 and 8,637.24

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Solution

The fourth proportional to 15,710.88, 21,680.82 and 8,637.24 is: 11,919.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,710.88 : 21,680.82 = 8,637.24 : x
  2. Step 2: Convert to fraction form
    15,710.88/21,680.82 = 8,637.24/x
  3. Step 3: Cross multiply
    15,710.88x = 21,680.82 × 8,637.24
  4. Step 4: Simplify right side
    15,710.88x = 187,262,445.74
  5. Step 5: Solve for x
    x = 187,262,445.74/15,710.88
  6. Step 6: Final answer
    x = 11,919.28

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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.