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Finding the Fourth Proportional to 78,004.80, 109,483.20 and 78,004.80

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Solution

The fourth proportional to 78,004.80, 109,483.20 and 78,004.80 is: 109,483.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,004.80 : 109,483.20 = 78,004.80 : x
  2. Step 2: Convert to fraction form
    78,004.80/109,483.20 = 78,004.80/x
  3. Step 3: Cross multiply
    78,004.80x = 109,483.20 × 78,004.80
  4. Step 4: Simplify right side
    78,004.80x = 8,540,215,119.36
  5. Step 5: Solve for x
    x = 8,540,215,119.36/78,004.80
  6. Step 6: Final answer
    x = 109,483.20

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.40) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.