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Finding the Fourth Proportional to 100,368.32, 138,510.05 and 55,045.90

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Solution

The fourth proportional to 100,368.32, 138,510.05 and 55,045.90 is: 75,964.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,368.32 : 138,510.05 = 55,045.90 : x
  2. Step 2: Convert to fraction form
    100,368.32/138,510.05 = 55,045.90/x
  3. Step 3: Cross multiply
    100,368.32x = 138,510.05 × 55,045.90
  4. Step 4: Simplify right side
    100,368.32x = 7,624,410,361.30
  5. Step 5: Solve for x
    x = 7,624,410,361.30/100,368.32
  6. Step 6: Final answer
    x = 75,964.31

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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.