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Finding the Fourth Proportional to 74,689.72, 103,070.48 and 40,698.50

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Solution

The fourth proportional to 74,689.72, 103,070.48 and 40,698.50 is: 56,163.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    74,689.72 : 103,070.48 = 40,698.50 : x
  2. Step 2: Convert to fraction form
    74,689.72/103,070.48 = 40,698.50/x
  3. Step 3: Cross multiply
    74,689.72x = 103,070.48 × 40,698.50
  4. Step 4: Simplify right side
    74,689.72x = 4,194,814,238.83
  5. Step 5: Solve for x
    x = 4,194,814,238.83/74,689.72
  6. Step 6: Final answer
    x = 56,163.21

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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.