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Finding the Fourth Proportional to 15,758.90, 21,746.29 and 8,685.37

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Solution

The fourth proportional to 15,758.90, 21,746.29 and 8,685.37 is: 11,985.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,758.90 : 21,746.29 = 8,685.37 : x
  2. Step 2: Convert to fraction form
    15,758.90/21,746.29 = 8,685.37/x
  3. Step 3: Cross multiply
    15,758.90x = 21,746.29 × 8,685.37
  4. Step 4: Simplify right side
    15,758.90x = 188,874,422.62
  5. Step 5: Solve for x
    x = 188,874,422.62/15,758.90
  6. Step 6: Final answer
    x = 11,985.26

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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.