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Finding the Fourth Proportional to 74,620.53, 102,978.86 and 40,630.34

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Solution

The fourth proportional to 74,620.53, 102,978.86 and 40,630.34 is: 56,071.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    74,620.53 : 102,978.86 = 40,630.34 : x
  2. Step 2: Convert to fraction form
    74,620.53/102,978.86 = 40,630.34/x
  3. Step 3: Cross multiply
    74,620.53x = 102,978.86 × 40,630.34
  4. Step 4: Simplify right side
    74,620.53x = 4,184,065,376.57
  5. Step 5: Solve for x
    x = 4,184,065,376.57/74,620.53
  6. Step 6: Final answer
    x = 56,071.24

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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.