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Finding the Fourth Proportional to 74,772.78, 103,128.11 and 47,917.80

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Solution

The fourth proportional to 74,772.78, 103,128.11 and 47,917.80 is: 66,089.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    74,772.78 : 103,128.11 = 47,917.80 : x
  2. Step 2: Convert to fraction form
    74,772.78/103,128.11 = 47,917.80/x
  3. Step 3: Cross multiply
    74,772.78x = 103,128.11 × 47,917.80
  4. Step 4: Simplify right side
    74,772.78x = 4,941,671,909.77
  5. Step 5: Solve for x
    x = 4,941,671,909.77/74,772.78
  6. Step 6: Final answer
    x = 66,089.18

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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.