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Finding the Fourth Proportional to 103,775.10, 155,662.65 and 68,345.70

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Solution

The fourth proportional to 103,775.10, 155,662.65 and 68,345.70 is: 102,518.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    103,775.10 : 155,662.65 = 68,345.70 : x
  2. Step 2: Convert to fraction form
    103,775.10/155,662.65 = 68,345.70/x
  3. Step 3: Cross multiply
    103,775.10x = 155,662.65 × 68,345.70
  4. Step 4: Simplify right side
    103,775.10x = 10,638,872,778.11
  5. Step 5: Solve for x
    x = 10,638,872,778.11/103,775.10
  6. Step 6: Final answer
    x = 102,518.55

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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.