Home / 21,287.36-31,881.80-20,549.24

Finding the Fourth Proportional to 21,287.36, 31,881.80 and 20,549.24

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Solution

The fourth proportional to 21,287.36, 31,881.80 and 20,549.24 is: 30,776.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,287.36 : 31,881.80 = 20,549.24 : x
  2. Step 2: Convert to fraction form
    21,287.36/31,881.80 = 20,549.24/x
  3. Step 3: Cross multiply
    21,287.36x = 31,881.80 × 20,549.24
  4. Step 4: Simplify right side
    21,287.36x = 655,146,950.69
  5. Step 5: Solve for x
    x = 655,146,950.69/21,287.36
  6. Step 6: Final answer
    x = 30,776.34

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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.