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Finding the Fourth Proportional to 20,957.20, 28,918.56 and 11,525.20

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Solution

The fourth proportional to 20,957.20, 28,918.56 and 11,525.20 is: 15,903.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,957.20 : 28,918.56 = 11,525.20 : x
  2. Step 2: Convert to fraction form
    20,957.20/28,918.56 = 11,525.20/x
  3. Step 3: Cross multiply
    20,957.20x = 28,918.56 × 11,525.20
  4. Step 4: Simplify right side
    20,957.20x = 333,292,187.71
  5. Step 5: Solve for x
    x = 333,292,187.71/20,957.20
  6. Step 6: Final answer
    x = 15,903.47

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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.