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Finding the Fourth Proportional to 74,623.86, 102,978.36 and 40,631.67

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Solution

The fourth proportional to 74,623.86, 102,978.36 and 40,631.67 is: 56,070.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    74,623.86 : 102,978.36 = 40,631.67 : x
  2. Step 2: Convert to fraction form
    74,623.86/102,978.36 = 40,631.67/x
  3. Step 3: Cross multiply
    74,623.86x = 102,978.36 × 40,631.67
  4. Step 4: Simplify right side
    74,623.86x = 4,184,182,740.66
  5. Step 5: Solve for x
    x = 4,184,182,740.66/74,623.86
  6. Step 6: Final answer
    x = 56,070.31

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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.