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Finding the Fourth Proportional to 15,894.78, 21,935.79 and 9,181.65

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Solution

The fourth proportional to 15,894.78, 21,935.79 and 9,181.65 is: 12,671.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,894.78 : 21,935.79 = 9,181.65 : x
  2. Step 2: Convert to fraction form
    15,894.78/21,935.79 = 9,181.65/x
  3. Step 3: Cross multiply
    15,894.78x = 21,935.79 × 9,181.65
  4. Step 4: Simplify right side
    15,894.78x = 201,406,746.25
  5. Step 5: Solve for x
    x = 201,406,746.25/15,894.78
  6. Step 6: Final answer
    x = 12,671.25

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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.