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Finding the Fourth Proportional to 15,239, 21,032.70 and 8,615

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Solution

The fourth proportional to 15,239, 21,032.70 and 8,615 is: 11,890.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,239 : 21,032.70 = 8,615 : x
  2. Step 2: Convert to fraction form
    15,239/21,032.70 = 8,615/x
  3. Step 3: Cross multiply
    15,239x = 21,032.70 × 8,615
  4. Step 4: Simplify right side
    15,239x = 181,196,710.50
  5. Step 5: Solve for x
    x = 181,196,710.50/15,239
  6. Step 6: Final answer
    x = 11,890.33

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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.