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Finding the Fourth Proportional to 10,368.72, 15,519.72 and 5,431.44

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Solution

The fourth proportional to 10,368.72, 15,519.72 and 5,431.44 is: 8,129.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    10,368.72 : 15,519.72 = 5,431.44 : x
  2. Step 2: Convert to fraction form
    10,368.72/15,519.72 = 5,431.44/x
  3. Step 3: Cross multiply
    10,368.72x = 15,519.72 × 5,431.44
  4. Step 4: Simplify right side
    10,368.72x = 84,294,428.00
  5. Step 5: Solve for x
    x = 84,294,428.00/10,368.72
  6. Step 6: Final answer
    x = 8,129.69

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.