Home / 20,783.89-28,681.80-11,352.45

Finding the Fourth Proportional to 20,783.89, 28,681.80 and 11,352.45

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Solution

The fourth proportional to 20,783.89, 28,681.80 and 11,352.45 is: 15,666.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,783.89 : 28,681.80 = 11,352.45 : x
  2. Step 2: Convert to fraction form
    20,783.89/28,681.80 = 11,352.45/x
  3. Step 3: Cross multiply
    20,783.89x = 28,681.80 × 11,352.45
  4. Step 4: Simplify right side
    20,783.89x = 325,608,765.40
  5. Step 5: Solve for x
    x = 325,608,765.40/20,783.89
  6. Step 6: Final answer
    x = 15,666.40

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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.