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Finding the Fourth Proportional to 130,636.80, 195,566.40 and 78,019.20

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Solution

The fourth proportional to 130,636.80, 195,566.40 and 78,019.20 is: 116,796.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    130,636.80 : 195,566.40 = 78,019.20 : x
  2. Step 2: Convert to fraction form
    130,636.80/195,566.40 = 78,019.20/x
  3. Step 3: Cross multiply
    130,636.80x = 195,566.40 × 78,019.20
  4. Step 4: Simplify right side
    130,636.80x = 15,257,934,074.88
  5. Step 5: Solve for x
    x = 15,257,934,074.88/130,636.80
  6. Step 6: Final answer
    x = 116,796.60

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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.