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Finding the Fourth Proportional to 42,881.55, 64,361.87 and 21,836.76

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Solution

The fourth proportional to 42,881.55, 64,361.87 and 21,836.76 is: 32,775.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    42,881.55 : 64,361.87 = 21,836.76 : x
  2. Step 2: Convert to fraction form
    42,881.55/64,361.87 = 21,836.76/x
  3. Step 3: Cross multiply
    42,881.55x = 64,361.87 × 21,836.76
  4. Step 4: Simplify right side
    42,881.55x = 1,405,454,708.34
  5. Step 5: Solve for x
    x = 1,405,454,708.34/42,881.55
  6. Step 6: Final answer
    x = 32,775.28

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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.