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Finding the Fourth Proportional to 103,505.70, 155,258.55 and 72,012.90

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Solution

The fourth proportional to 103,505.70, 155,258.55 and 72,012.90 is: 108,019.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    103,505.70 : 155,258.55 = 72,012.90 : x
  2. Step 2: Convert to fraction form
    103,505.70/155,258.55 = 72,012.90/x
  3. Step 3: Cross multiply
    103,505.70x = 155,258.55 × 72,012.90
  4. Step 4: Simplify right side
    103,505.70x = 11,180,618,435.30
  5. Step 5: Solve for x
    x = 11,180,618,435.30/103,505.70
  6. Step 6: Final answer
    x = 108,019.35

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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.