Home / 12,628.76-17,421.28-9,639.40

Finding the Fourth Proportional to 12,628.76, 17,421.28 and 9,639.40

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Solution

The fourth proportional to 12,628.76, 17,421.28 and 9,639.40 is: 13,297.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,628.76 : 17,421.28 = 9,639.40 : x
  2. Step 2: Convert to fraction form
    12,628.76/17,421.28 = 9,639.40/x
  3. Step 3: Cross multiply
    12,628.76x = 17,421.28 × 9,639.40
  4. Step 4: Simplify right side
    12,628.76x = 167,930,686.43
  5. Step 5: Solve for x
    x = 167,930,686.43/12,628.76
  6. Step 6: Final answer
    x = 13,297.48

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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.