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Finding the Fourth Proportional to 103,636.10, 155,454.15 and 78,752.90

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Solution

The fourth proportional to 103,636.10, 155,454.15 and 78,752.90 is: 118,129.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    103,636.10 : 155,454.15 = 78,752.90 : x
  2. Step 2: Convert to fraction form
    103,636.10/155,454.15 = 78,752.90/x
  3. Step 3: Cross multiply
    103,636.10x = 155,454.15 × 78,752.90
  4. Step 4: Simplify right side
    103,636.10x = 12,242,465,129.54
  5. Step 5: Solve for x
    x = 12,242,465,129.54/103,636.10
  6. Step 6: Final answer
    x = 118,129.35

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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.