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Finding the Fourth Proportional to 15,455.52, 21,328.56 and 8,381.52

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Solution

The fourth proportional to 15,455.52, 21,328.56 and 8,381.52 is: 11,566.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,455.52 : 21,328.56 = 8,381.52 : x
  2. Step 2: Convert to fraction form
    15,455.52/21,328.56 = 8,381.52/x
  3. Step 3: Cross multiply
    15,455.52x = 21,328.56 × 8,381.52
  4. Step 4: Simplify right side
    15,455.52x = 178,765,752.21
  5. Step 5: Solve for x
    x = 178,765,752.21/15,455.52
  6. Step 6: Final answer
    x = 11,566.47

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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.