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Finding the Fourth Proportional to 78,608.80, 117,913.20 and 76,421.80

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Solution

The fourth proportional to 78,608.80, 117,913.20 and 76,421.80 is: 114,632.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,608.80 : 117,913.20 = 76,421.80 : x
  2. Step 2: Convert to fraction form
    78,608.80/117,913.20 = 76,421.80/x
  3. Step 3: Cross multiply
    78,608.80x = 117,913.20 × 76,421.80
  4. Step 4: Simplify right side
    78,608.80x = 9,011,138,987.76
  5. Step 5: Solve for x
    x = 9,011,138,987.76/78,608.80
  6. Step 6: Final answer
    x = 114,632.70

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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.