Home / 20,845.89-28,765.80-12,888.32

Finding the Fourth Proportional to 20,845.89, 28,765.80 and 12,888.32

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Solution

The fourth proportional to 20,845.89, 28,765.80 and 12,888.32 is: 17,784.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,845.89 : 28,765.80 = 12,888.32 : x
  2. Step 2: Convert to fraction form
    20,845.89/28,765.80 = 12,888.32/x
  3. Step 3: Cross multiply
    20,845.89x = 28,765.80 × 12,888.32
  4. Step 4: Simplify right side
    20,845.89x = 370,742,691.63
  5. Step 5: Solve for x
    x = 370,742,691.63/20,845.89
  6. Step 6: Final answer
    x = 17,784.93

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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.