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Finding the Fourth Proportional to 74,983, 103,478.80 and 40,990.72

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Solution

The fourth proportional to 74,983, 103,478.80 and 40,990.72 is: 56,568.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    74,983 : 103,478.80 = 40,990.72 : x
  2. Step 2: Convert to fraction form
    74,983/103,478.80 = 40,990.72/x
  3. Step 3: Cross multiply
    74,983x = 103,478.80 × 40,990.72
  4. Step 4: Simplify right side
    74,983x = 4,241,670,516.74
  5. Step 5: Solve for x
    x = 4,241,670,516.74/74,983
  6. Step 6: Final answer
    x = 56,568.43

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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.