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Finding the Fourth Proportional to 103,638.71, 155,458.14 and 28,758.93

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Solution

The fourth proportional to 103,638.71, 155,458.14 and 28,758.93 is: 43,138.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    103,638.71 : 155,458.14 = 28,758.93 : x
  2. Step 2: Convert to fraction form
    103,638.71/155,458.14 = 28,758.93/x
  3. Step 3: Cross multiply
    103,638.71x = 155,458.14 × 28,758.93
  4. Step 4: Simplify right side
    103,638.71x = 4,470,809,766.19
  5. Step 5: Solve for x
    x = 4,470,809,766.19/103,638.71
  6. Step 6: Final answer
    x = 43,138.42

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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.