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Finding the Fourth Proportional to 15,703.36, 21,671.12 and 8,630

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Solution

The fourth proportional to 15,703.36, 21,671.12 and 8,630 is: 11,909.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,703.36 : 21,671.12 = 8,630 : x
  2. Step 2: Convert to fraction form
    15,703.36/21,671.12 = 8,630/x
  3. Step 3: Cross multiply
    15,703.36x = 21,671.12 × 8,630
  4. Step 4: Simplify right side
    15,703.36x = 187,021,765.60
  5. Step 5: Solve for x
    x = 187,021,765.60/15,703.36
  6. Step 6: Final answer
    x = 11,909.67

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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.