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Finding the Fourth Proportional to 20,955, 28,911.42 and 13,885.32

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Solution

The fourth proportional to 20,955, 28,911.42 and 13,885.32 is: 19,157.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,955 : 28,911.42 = 13,885.32 : x
  2. Step 2: Convert to fraction form
    20,955/28,911.42 = 13,885.32/x
  3. Step 3: Cross multiply
    20,955x = 28,911.42 × 13,885.32
  4. Step 4: Simplify right side
    20,955x = 401,444,318.35
  5. Step 5: Solve for x
    x = 401,444,318.35/20,955
  6. Step 6: Final answer
    x = 19,157.45

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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.