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Finding the Fourth Proportional to 15,402.84, 21,255.84 and 8,690.66

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Solution

The fourth proportional to 15,402.84, 21,255.84 and 8,690.66 is: 11,993.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,402.84 : 21,255.84 = 8,690.66 : x
  2. Step 2: Convert to fraction form
    15,402.84/21,255.84 = 8,690.66/x
  3. Step 3: Cross multiply
    15,402.84x = 21,255.84 × 8,690.66
  4. Step 4: Simplify right side
    15,402.84x = 184,727,172.18
  5. Step 5: Solve for x
    x = 184,727,172.18/15,402.84
  6. Step 6: Final answer
    x = 11,993.06

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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.