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Finding the Fourth Proportional to 15,058.79, 20,780.57 and 8,685.65

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Solution

The fourth proportional to 15,058.79, 20,780.57 and 8,685.65 is: 11,985.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,058.79 : 20,780.57 = 8,685.65 : x
  2. Step 2: Convert to fraction form
    15,058.79/20,780.57 = 8,685.65/x
  3. Step 3: Cross multiply
    15,058.79x = 20,780.57 × 8,685.65
  4. Step 4: Simplify right side
    15,058.79x = 180,492,757.82
  5. Step 5: Solve for x
    x = 180,492,757.82/15,058.79
  6. Step 6: Final answer
    x = 11,985.87

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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.