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Finding the Fourth Proportional to 15,605.79, 21,530.72 and 8,886.65

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Solution

The fourth proportional to 15,605.79, 21,530.72 and 8,886.65 is: 12,260.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,605.79 : 21,530.72 = 8,886.65 : x
  2. Step 2: Convert to fraction form
    15,605.79/21,530.72 = 8,886.65/x
  3. Step 3: Cross multiply
    15,605.79x = 21,530.72 × 8,886.65
  4. Step 4: Simplify right side
    15,605.79x = 191,335,982.28
  5. Step 5: Solve for x
    x = 191,335,982.28/15,605.79
  6. Step 6: Final answer
    x = 12,260.58

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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.