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Finding the Fourth Proportional to 74,479.61, 102,782.30 and 40,488.36

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Solution

The fourth proportional to 74,479.61, 102,782.30 and 40,488.36 is: 55,874.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    74,479.61 : 102,782.30 = 40,488.36 : x
  2. Step 2: Convert to fraction form
    74,479.61/102,782.30 = 40,488.36/x
  3. Step 3: Cross multiply
    74,479.61x = 102,782.30 × 40,488.36
  4. Step 4: Simplify right side
    74,479.61x = 4,161,486,561.59
  5. Step 5: Solve for x
    x = 4,161,486,561.59/74,479.61
  6. Step 6: Final answer
    x = 55,874.18

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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.