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Finding the Fourth Proportional to 28,387.56, 39,175.14 and 15,813

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Solution

The fourth proportional to 28,387.56, 39,175.14 and 15,813 is: 21,822.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,387.56 : 39,175.14 = 15,813 : x
  2. Step 2: Convert to fraction form
    28,387.56/39,175.14 = 15,813/x
  3. Step 3: Cross multiply
    28,387.56x = 39,175.14 × 15,813
  4. Step 4: Simplify right side
    28,387.56x = 619,476,488.82
  5. Step 5: Solve for x
    x = 619,476,488.82/28,387.56
  6. Step 6: Final answer
    x = 21,822.11

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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.