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Finding the Fourth Proportional to 13,699, 18,907.64 and 8,910.60

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Solution

The fourth proportional to 13,699, 18,907.64 and 8,910.60 is: 12,298.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,699 : 18,907.64 = 8,910.60 : x
  2. Step 2: Convert to fraction form
    13,699/18,907.64 = 8,910.60/x
  3. Step 3: Cross multiply
    13,699x = 18,907.64 × 8,910.60
  4. Step 4: Simplify right side
    13,699x = 168,478,416.98
  5. Step 5: Solve for x
    x = 168,478,416.98/13,699
  6. Step 6: Final answer
    x = 12,298.59

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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.