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Finding the Fourth Proportional to 12,697.26, 17,520.13 and 7,978.18

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Solution

The fourth proportional to 12,697.26, 17,520.13 and 7,978.18 is: 11,008.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,697.26 : 17,520.13 = 7,978.18 : x
  2. Step 2: Convert to fraction form
    12,697.26/17,520.13 = 7,978.18/x
  3. Step 3: Cross multiply
    12,697.26x = 17,520.13 × 7,978.18
  4. Step 4: Simplify right side
    12,697.26x = 139,778,750.76
  5. Step 5: Solve for x
    x = 139,778,750.76/12,697.26
  6. Step 6: Final answer
    x = 11,008.58

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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.