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Finding the Fourth Proportional to 43,361.87, 64,919.81 and 28,386.45

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Solution

The fourth proportional to 43,361.87, 64,919.81 and 28,386.45 is: 42,499.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    43,361.87 : 64,919.81 = 28,386.45 : x
  2. Step 2: Convert to fraction form
    43,361.87/64,919.81 = 28,386.45/x
  3. Step 3: Cross multiply
    43,361.87x = 64,919.81 × 28,386.45
  4. Step 4: Simplify right side
    43,361.87x = 1,842,843,011.54
  5. Step 5: Solve for x
    x = 1,842,843,011.54/43,361.87
  6. Step 6: Final answer
    x = 42,499.16

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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.