Home / 12,729.92-17,564.64-7,140.80

Finding the Fourth Proportional to 12,729.92, 17,564.64 and 7,140.80

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Solution

The fourth proportional to 12,729.92, 17,564.64 and 7,140.80 is: 9,852.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,729.92 : 17,564.64 = 7,140.80 : x
  2. Step 2: Convert to fraction form
    12,729.92/17,564.64 = 7,140.80/x
  3. Step 3: Cross multiply
    12,729.92x = 17,564.64 × 7,140.80
  4. Step 4: Simplify right side
    12,729.92x = 125,425,581.31
  5. Step 5: Solve for x
    x = 125,425,581.31/12,729.92
  6. Step 6: Final answer
    x = 9,852.82

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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.