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Finding the Fourth Proportional to 171,720.60, 257,580.90 and 78,408.60

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Solution

The fourth proportional to 171,720.60, 257,580.90 and 78,408.60 is: 117,612.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    171,720.60 : 257,580.90 = 78,408.60 : x
  2. Step 2: Convert to fraction form
    171,720.60/257,580.90 = 78,408.60/x
  3. Step 3: Cross multiply
    171,720.60x = 257,580.90 × 78,408.60
  4. Step 4: Simplify right side
    171,720.60x = 20,196,557,755.74
  5. Step 5: Solve for x
    x = 20,196,557,755.74/171,720.60
  6. Step 6: Final answer
    x = 117,612.90

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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.