Home / 21,003.56-31,505.28-5,421.08

Finding the Fourth Proportional to 21,003.56, 31,505.28 and 5,421.08

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Solution

The fourth proportional to 21,003.56, 31,505.28 and 5,421.08 is: 8,131.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,003.56 : 31,505.28 = 5,421.08 : x
  2. Step 2: Convert to fraction form
    21,003.56/31,505.28 = 5,421.08/x
  3. Step 3: Cross multiply
    21,003.56x = 31,505.28 × 5,421.08
  4. Step 4: Simplify right side
    21,003.56x = 170,792,643.30
  5. Step 5: Solve for x
    x = 170,792,643.30/21,003.56
  6. Step 6: Final answer
    x = 8,131.60

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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.