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Finding the Fourth Proportional to 15,703.89, 21,670.91 and 8,989.30

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Solution

The fourth proportional to 15,703.89, 21,670.91 and 8,989.30 is: 12,404.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,703.89 : 21,670.91 = 8,989.30 : x
  2. Step 2: Convert to fraction form
    15,703.89/21,670.91 = 8,989.30/x
  3. Step 3: Cross multiply
    15,703.89x = 21,670.91 × 8,989.30
  4. Step 4: Simplify right side
    15,703.89x = 194,806,202.91
  5. Step 5: Solve for x
    x = 194,806,202.91/15,703.89
  6. Step 6: Final answer
    x = 12,404.96

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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.