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Finding the Fourth Proportional to 15,758.85, 21,746.97 and 8,685.53

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Solution

The fourth proportional to 15,758.85, 21,746.97 and 8,685.53 is: 11,985.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,758.85 : 21,746.97 = 8,685.53 : x
  2. Step 2: Convert to fraction form
    15,758.85/21,746.97 = 8,685.53/x
  3. Step 3: Cross multiply
    15,758.85x = 21,746.97 × 8,685.53
  4. Step 4: Simplify right side
    15,758.85x = 188,883,960.34
  5. Step 5: Solve for x
    x = 188,883,960.34/15,758.85
  6. Step 6: Final answer
    x = 11,985.90

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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.