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Finding the Fourth Proportional to 15,909.60, 21,955.20 and 9,620.16

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Solution

The fourth proportional to 15,909.60, 21,955.20 and 9,620.16 is: 13,275.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,909.60 : 21,955.20 = 9,620.16 : x
  2. Step 2: Convert to fraction form
    15,909.60/21,955.20 = 9,620.16/x
  3. Step 3: Cross multiply
    15,909.60x = 21,955.20 × 9,620.16
  4. Step 4: Simplify right side
    15,909.60x = 211,212,536.83
  5. Step 5: Solve for x
    x = 211,212,536.83/15,909.60
  6. Step 6: Final answer
    x = 13,275.79

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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.