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Finding the Fourth Proportional to 12,486.40, 17,230.40 and 6,897.28

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Solution

The fourth proportional to 12,486.40, 17,230.40 and 6,897.28 is: 9,517.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,486.40 : 17,230.40 = 6,897.28 : x
  2. Step 2: Convert to fraction form
    12,486.40/17,230.40 = 6,897.28/x
  3. Step 3: Cross multiply
    12,486.40x = 17,230.40 × 6,897.28
  4. Step 4: Simplify right side
    12,486.40x = 118,842,893.31
  5. Step 5: Solve for x
    x = 118,842,893.31/12,486.40
  6. Step 6: Final answer
    x = 9,517.79

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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.