Home / 103,712.90-155,569.35-78,829.70

Finding the Fourth Proportional to 103,712.90, 155,569.35 and 78,829.70

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Solution

The fourth proportional to 103,712.90, 155,569.35 and 78,829.70 is: 118,244.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    103,712.90 : 155,569.35 = 78,829.70 : x
  2. Step 2: Convert to fraction form
    103,712.90/155,569.35 = 78,829.70/x
  3. Step 3: Cross multiply
    103,712.90x = 155,569.35 × 78,829.70
  4. Step 4: Simplify right side
    103,712.90x = 12,263,485,189.70
  5. Step 5: Solve for x
    x = 12,263,485,189.70/103,712.90
  6. Step 6: Final answer
    x = 118,244.55

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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.