Home / 21,127.36-31,655.40-13,720.72

Finding the Fourth Proportional to 21,127.36, 31,655.40 and 13,720.72

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Solution

The fourth proportional to 21,127.36, 31,655.40 and 13,720.72 is: 20,557.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,127.36 : 31,655.40 = 13,720.72 : x
  2. Step 2: Convert to fraction form
    21,127.36/31,655.40 = 13,720.72/x
  3. Step 3: Cross multiply
    21,127.36x = 31,655.40 × 13,720.72
  4. Step 4: Simplify right side
    21,127.36x = 434,334,879.89
  5. Step 5: Solve for x
    x = 434,334,879.89/21,127.36
  6. Step 6: Final answer
    x = 20,557.93

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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.