Home / 20,970.12-28,938.78-11,538.48

Finding the Fourth Proportional to 20,970.12, 28,938.78 and 11,538.48

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Solution

The fourth proportional to 20,970.12, 28,938.78 and 11,538.48 is: 15,923.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,970.12 : 28,938.78 = 11,538.48 : x
  2. Step 2: Convert to fraction form
    20,970.12/28,938.78 = 11,538.48/x
  3. Step 3: Cross multiply
    20,970.12x = 28,938.78 × 11,538.48
  4. Step 4: Simplify right side
    20,970.12x = 333,909,534.25
  5. Step 5: Solve for x
    x = 333,909,534.25/20,970.12
  6. Step 6: Final answer
    x = 15,923.11

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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.