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Finding the Fourth Proportional to 74,628.40, 102,987.03 and 40,636.36

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Solution

The fourth proportional to 74,628.40, 102,987.03 and 40,636.36 is: 56,078.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    74,628.40 : 102,987.03 = 40,636.36 : x
  2. Step 2: Convert to fraction form
    74,628.40/102,987.03 = 40,636.36/x
  3. Step 3: Cross multiply
    74,628.40x = 102,987.03 × 40,636.36
  4. Step 4: Simplify right side
    74,628.40x = 4,185,018,026.41
  5. Step 5: Solve for x
    x = 4,185,018,026.41/74,628.40
  6. Step 6: Final answer
    x = 56,078.09

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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.