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Finding the Fourth Proportional to 78,361.68, 108,139.36 and 42,551.92

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Solution

The fourth proportional to 78,361.68, 108,139.36 and 42,551.92 is: 58,721.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,361.68 : 108,139.36 = 42,551.92 : x
  2. Step 2: Convert to fraction form
    78,361.68/108,139.36 = 42,551.92/x
  3. Step 3: Cross multiply
    78,361.68x = 108,139.36 × 42,551.92
  4. Step 4: Simplify right side
    78,361.68x = 4,601,537,395.57
  5. Step 5: Solve for x
    x = 4,601,537,395.57/78,361.68
  6. Step 6: Final answer
    x = 58,721.78

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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.