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Finding the Fourth Proportional to 135,128.61, 186,476.25 and 74,700.81

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Solution

The fourth proportional to 135,128.61, 186,476.25 and 74,700.81 is: 103,086.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    135,128.61 : 186,476.25 = 74,700.81 : x
  2. Step 2: Convert to fraction form
    135,128.61/186,476.25 = 74,700.81/x
  3. Step 3: Cross multiply
    135,128.61x = 186,476.25 × 74,700.81
  4. Step 4: Simplify right side
    135,128.61x = 13,929,926,920.76
  5. Step 5: Solve for x
    x = 13,929,926,920.76/135,128.61
  6. Step 6: Final answer
    x = 103,086.44

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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.