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Finding the Fourth Proportional to 12,717.58, 17,550.18 and 7,128.58

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Solution

The fourth proportional to 12,717.58, 17,550.18 and 7,128.58 is: 9,837.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,717.58 : 17,550.18 = 7,128.58 : x
  2. Step 2: Convert to fraction form
    12,717.58/17,550.18 = 7,128.58/x
  3. Step 3: Cross multiply
    12,717.58x = 17,550.18 × 7,128.58
  4. Step 4: Simplify right side
    12,717.58x = 125,107,862.14
  5. Step 5: Solve for x
    x = 125,107,862.14/12,717.58
  6. Step 6: Final answer
    x = 9,837.40

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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.