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Finding the Fourth Proportional to 74,678.59, 103,055.88 and 40,686.97

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Solution

The fourth proportional to 74,678.59, 103,055.88 and 40,686.97 is: 56,147.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    74,678.59 : 103,055.88 = 40,686.97 : x
  2. Step 2: Convert to fraction form
    74,678.59/103,055.88 = 40,686.97/x
  3. Step 3: Cross multiply
    74,678.59x = 103,055.88 × 40,686.97
  4. Step 4: Simplify right side
    74,678.59x = 4,193,031,673.76
  5. Step 5: Solve for x
    x = 4,193,031,673.76/74,678.59
  6. Step 6: Final answer
    x = 56,147.71

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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.