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Finding the Fourth Proportional to 103,628.60, 155,442.90 and 78,745.40

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Solution

The fourth proportional to 103,628.60, 155,442.90 and 78,745.40 is: 118,118.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    103,628.60 : 155,442.90 = 78,745.40 : x
  2. Step 2: Convert to fraction form
    103,628.60/155,442.90 = 78,745.40/x
  3. Step 3: Cross multiply
    103,628.60x = 155,442.90 × 78,745.40
  4. Step 4: Simplify right side
    103,628.60x = 12,240,413,337.66
  5. Step 5: Solve for x
    x = 12,240,413,337.66/103,628.60
  6. Step 6: Final answer
    x = 118,118.10

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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.