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Finding the Fourth Proportional to 100,643.66, 138,888.61 and 55,325.57

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Solution

The fourth proportional to 100,643.66, 138,888.61 and 55,325.57 is: 76,349.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,643.66 : 138,888.61 = 55,325.57 : x
  2. Step 2: Convert to fraction form
    100,643.66/138,888.61 = 55,325.57/x
  3. Step 3: Cross multiply
    100,643.66x = 138,888.61 × 55,325.57
  4. Step 4: Simplify right side
    100,643.66x = 7,684,091,723.67
  5. Step 5: Solve for x
    x = 7,684,091,723.67/100,643.66
  6. Step 6: Final answer
    x = 76,349.49

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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.