Home / 20,864.40-31,301.28-7,717.20

Finding the Fourth Proportional to 20,864.40, 31,301.28 and 7,717.20

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Solution

The fourth proportional to 20,864.40, 31,301.28 and 7,717.20 is: 11,577.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,864.40 : 31,301.28 = 7,717.20 : x
  2. Step 2: Convert to fraction form
    20,864.40/31,301.28 = 7,717.20/x
  3. Step 3: Cross multiply
    20,864.40x = 31,301.28 × 7,717.20
  4. Step 4: Simplify right side
    20,864.40x = 241,558,238.02
  5. Step 5: Solve for x
    x = 241,558,238.02/20,864.40
  6. Step 6: Final answer
    x = 11,577.53

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.