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Finding the Fourth Proportional to 31,157.52, 42,968.16 and 20,528.64

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Solution

The fourth proportional to 31,157.52, 42,968.16 and 20,528.64 is: 28,310.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    31,157.52 : 42,968.16 = 20,528.64 : x
  2. Step 2: Convert to fraction form
    31,157.52/42,968.16 = 20,528.64/x
  3. Step 3: Cross multiply
    31,157.52x = 42,968.16 × 20,528.64
  4. Step 4: Simplify right side
    31,157.52x = 882,077,888.10
  5. Step 5: Solve for x
    x = 882,077,888.10/31,157.52
  6. Step 6: Final answer
    x = 28,310.27

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These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.