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Finding the Fourth Proportional to 74,985.69, 103,478.49 and 40,994.43

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Solution

The fourth proportional to 74,985.69, 103,478.49 and 40,994.43 is: 56,571.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    74,985.69 : 103,478.49 = 40,994.43 : x
  2. Step 2: Convert to fraction form
    74,985.69/103,478.49 = 40,994.43/x
  3. Step 3: Cross multiply
    74,985.69x = 103,478.49 × 40,994.43
  4. Step 4: Simplify right side
    74,985.69x = 4,242,041,714.81
  5. Step 5: Solve for x
    x = 4,242,041,714.81/74,985.69
  6. Step 6: Final answer
    x = 56,571.35

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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.