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Finding the Fourth Proportional to 74,990.72, 103,487.80 and 40,998.80

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Solution

The fourth proportional to 74,990.72, 103,487.80 and 40,998.80 is: 56,578.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    74,990.72 : 103,487.80 = 40,998.80 : x
  2. Step 2: Convert to fraction form
    74,990.72/103,487.80 = 40,998.80/x
  3. Step 3: Cross multiply
    74,990.72x = 103,487.80 × 40,998.80
  4. Step 4: Simplify right side
    74,990.72x = 4,242,875,614.64
  5. Step 5: Solve for x
    x = 4,242,875,614.64/74,990.72
  6. Step 6: Final answer
    x = 56,578.68

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1.5x scale

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.