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Finding the Fourth Proportional to 43,990.90, 65,973.29 and 12,398.67

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Solution

The fourth proportional to 43,990.90, 65,973.29 and 12,398.67 is: 18,594.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    43,990.90 : 65,973.29 = 12,398.67 : x
  2. Step 2: Convert to fraction form
    43,990.90/65,973.29 = 12,398.67/x
  3. Step 3: Cross multiply
    43,990.90x = 65,973.29 × 12,398.67
  4. Step 4: Simplify right side
    43,990.90x = 817,980,989.53
  5. Step 5: Solve for x
    x = 817,980,989.53/43,990.90
  6. Step 6: Final answer
    x = 18,594.32

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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.