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Finding the Fourth Proportional to 78,346.40, 117,519.60 and 38,980.40

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Solution

The fourth proportional to 78,346.40, 117,519.60 and 38,980.40 is: 58,470.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,346.40 : 117,519.60 = 38,980.40 : x
  2. Step 2: Convert to fraction form
    78,346.40/117,519.60 = 38,980.40/x
  3. Step 3: Cross multiply
    78,346.40x = 117,519.60 × 38,980.40
  4. Step 4: Simplify right side
    78,346.40x = 4,580,961,015.84
  5. Step 5: Solve for x
    x = 4,580,961,015.84/78,346.40
  6. Step 6: Final answer
    x = 58,470.60

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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.