Home / 103,661.35-155,656.05-78,729.55

Finding the Fourth Proportional to 103,661.35, 155,656.05 and 78,729.55

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Solution

The fourth proportional to 103,661.35, 155,656.05 and 78,729.55 is: 118,218.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    103,661.35 : 155,656.05 = 78,729.55 : x
  2. Step 2: Convert to fraction form
    103,661.35/155,656.05 = 78,729.55/x
  3. Step 3: Cross multiply
    103,661.35x = 155,656.05 × 78,729.55
  4. Step 4: Simplify right side
    103,661.35x = 12,254,730,771.28
  5. Step 5: Solve for x
    x = 12,254,730,771.28/103,661.35
  6. Step 6: Final answer
    x = 118,218.90

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.