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Finding the Fourth Proportional to 43,685.76, 65,528.64 and 12,521

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Solution

The fourth proportional to 43,685.76, 65,528.64 and 12,521 is: 18,781.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    43,685.76 : 65,528.64 = 12,521 : x
  2. Step 2: Convert to fraction form
    43,685.76/65,528.64 = 12,521/x
  3. Step 3: Cross multiply
    43,685.76x = 65,528.64 × 12,521
  4. Step 4: Simplify right side
    43,685.76x = 820,484,101.44
  5. Step 5: Solve for x
    x = 820,484,101.44/43,685.76
  6. Step 6: Final answer
    x = 18,781.50

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.