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Finding the Fourth Proportional to 130,420.40, 195,630.60 and 85,319.60

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Solution

The fourth proportional to 130,420.40, 195,630.60 and 85,319.60 is: 127,979.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    130,420.40 : 195,630.60 = 85,319.60 : x
  2. Step 2: Convert to fraction form
    130,420.40/195,630.60 = 85,319.60/x
  3. Step 3: Cross multiply
    130,420.40x = 195,630.60 × 85,319.60
  4. Step 4: Simplify right side
    130,420.40x = 16,691,124,539.76
  5. Step 5: Solve for x
    x = 16,691,124,539.76/130,420.40
  6. Step 6: Final answer
    x = 127,979.40

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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.