Home / 15,707.21-21,655.73-12,864.11

Finding the Fourth Proportional to 15,707.21, 21,655.73 and 12,864.11

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Solution

The fourth proportional to 15,707.21, 21,655.73 and 12,864.11 is: 17,735.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,707.21 : 21,655.73 = 12,864.11 : x
  2. Step 2: Convert to fraction form
    15,707.21/21,655.73 = 12,864.11/x
  3. Step 3: Cross multiply
    15,707.21x = 21,655.73 × 12,864.11
  4. Step 4: Simplify right side
    15,707.21x = 278,581,616.73
  5. Step 5: Solve for x
    x = 278,581,616.73/15,707.21
  6. Step 6: Final answer
    x = 17,735.91

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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.