Home / 103,639.90-155,459.85-78,756.70

Finding the Fourth Proportional to 103,639.90, 155,459.85 and 78,756.70

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Solution

The fourth proportional to 103,639.90, 155,459.85 and 78,756.70 is: 118,135.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    103,639.90 : 155,459.85 = 78,756.70 : x
  2. Step 2: Convert to fraction form
    103,639.90/155,459.85 = 78,756.70/x
  3. Step 3: Cross multiply
    103,639.90x = 155,459.85 × 78,756.70
  4. Step 4: Simplify right side
    103,639.90x = 12,243,504,768.50
  5. Step 5: Solve for x
    x = 12,243,504,768.50/103,639.90
  6. Step 6: Final answer
    x = 118,135.05

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1.5x scale

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.