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Finding the Fourth Proportional to 15,725, 21,701.10 and 8,651.28

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Solution

The fourth proportional to 15,725, 21,701.10 and 8,651.28 is: 11,939.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,725 : 21,701.10 = 8,651.28 : x
  2. Step 2: Convert to fraction form
    15,725/21,701.10 = 8,651.28/x
  3. Step 3: Cross multiply
    15,725x = 21,701.10 × 8,651.28
  4. Step 4: Simplify right side
    15,725x = 187,742,292.41
  5. Step 5: Solve for x
    x = 187,742,292.41/15,725
  6. Step 6: Final answer
    x = 11,939.10

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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.