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Finding the Fourth Proportional to 78,813.60, 118,199.60 and 39,341.60

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Solution

The fourth proportional to 78,813.60, 118,199.60 and 39,341.60 is: 59,002.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,813.60 : 118,199.60 = 39,341.60 : x
  2. Step 2: Convert to fraction form
    78,813.60/118,199.60 = 39,341.60/x
  3. Step 3: Cross multiply
    78,813.60x = 118,199.60 × 39,341.60
  4. Step 4: Simplify right side
    78,813.60x = 4,650,161,383.36
  5. Step 5: Solve for x
    x = 4,650,161,383.36/78,813.60
  6. Step 6: Final answer
    x = 59,002.02

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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.