Home / 21,018.32-31,538.48-13,620.88

Finding the Fourth Proportional to 21,018.32, 31,538.48 and 13,620.88

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Solution

The fourth proportional to 21,018.32, 31,538.48 and 13,620.88 is: 20,438.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,018.32 : 31,538.48 = 13,620.88 : x
  2. Step 2: Convert to fraction form
    21,018.32/31,538.48 = 13,620.88/x
  3. Step 3: Cross multiply
    21,018.32x = 31,538.48 × 13,620.88
  4. Step 4: Simplify right side
    21,018.32x = 429,581,851.46
  5. Step 5: Solve for x
    x = 429,581,851.46/21,018.32
  6. Step 6: Final answer
    x = 20,438.45

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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.