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Finding the Fourth Proportional to 12,444.60, 17,172 and 8,420.22

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Solution

The fourth proportional to 12,444.60, 17,172 and 8,420.22 is: 11,618.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,444.60 : 17,172 = 8,420.22 : x
  2. Step 2: Convert to fraction form
    12,444.60/17,172 = 8,420.22/x
  3. Step 3: Cross multiply
    12,444.60x = 17,172 × 8,420.22
  4. Step 4: Simplify right side
    12,444.60x = 144,592,017.84
  5. Step 5: Solve for x
    x = 144,592,017.84/12,444.60
  6. Step 6: Final answer
    x = 11,618.86

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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.