Home / 15,551.55-21,450.20-9,581.31

Finding the Fourth Proportional to 15,551.55, 21,450.20 and 9,581.31

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Solution

The fourth proportional to 15,551.55, 21,450.20 and 9,581.31 is: 13,215.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,551.55 : 21,450.20 = 9,581.31 : x
  2. Step 2: Convert to fraction form
    15,551.55/21,450.20 = 9,581.31/x
  3. Step 3: Cross multiply
    15,551.55x = 21,450.20 × 9,581.31
  4. Step 4: Simplify right side
    15,551.55x = 205,520,967.86
  5. Step 5: Solve for x
    x = 205,520,967.86/15,551.55
  6. Step 6: Final answer
    x = 13,215.47

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.