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Finding the Fourth Proportional to 80,420.80, 120,746.40 and 45,428.80

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Solution

The fourth proportional to 80,420.80, 120,746.40 and 45,428.80 is: 68,208.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,420.80 : 120,746.40 = 45,428.80 : x
  2. Step 2: Convert to fraction form
    80,420.80/120,746.40 = 45,428.80/x
  3. Step 3: Cross multiply
    80,420.80x = 120,746.40 × 45,428.80
  4. Step 4: Simplify right side
    80,420.80x = 5,485,364,056.32
  5. Step 5: Solve for x
    x = 5,485,364,056.32/80,420.80
  6. Step 6: Final answer
    x = 68,208.28

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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.