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Finding the Fourth Proportional to 75,129.61, 103,679.03 and 40,674.71

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Solution

The fourth proportional to 75,129.61, 103,679.03 and 40,674.71 is: 56,131.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    75,129.61 : 103,679.03 = 40,674.71 : x
  2. Step 2: Convert to fraction form
    75,129.61/103,679.03 = 40,674.71/x
  3. Step 3: Cross multiply
    75,129.61x = 103,679.03 × 40,674.71
  4. Step 4: Simplify right side
    75,129.61x = 4,217,113,959.94
  5. Step 5: Solve for x
    x = 4,217,113,959.94/75,129.61
  6. Step 6: Final answer
    x = 56,131.18

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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.